监控术语知识解答...

<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">1 cctv</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">的含义是什么？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">中等</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> cctv </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">是英文</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">closed circuit television</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">的缩写，意思是闭路电视监控系统</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp;&nbsp;2 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是镜头的焦距？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">中等</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">从光学原理来讲焦距就是从焦点到透镜中心的距离。即焦距长度。如</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">"f=8-24mm</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">，</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">"</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">，就是指镜头的焦距长度为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">8-24mm<br/>&nbsp; 3 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">焦距长短与成像大小</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">视角大小有什么关系？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">焦距长短与成像大小成正比，焦距越长成像越大，焦距越短成像越小。镜头焦距长短与视角大小成反比，焦距越长视角越小，焦距越短视角越大。</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp;&nbsp;4</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">焦距长短与景深</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">透视感又什么关系？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">焦距长短与景深成反比，焦距越长景深越小，焦距越短景深越大。焦距长短与透视感的强弱成反比，焦距越长透视感越弱，焦距越短透视感越强</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 5 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是摄像机的后焦调整？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">当安装上标准镜头，要使被摄景物的成像恰好成在</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">ccd</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">图像传感器的靶面上，可以采用固定镜头，而调整</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">ccd</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">的位置的方法这种方法叫摄像机的后焦条整</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 6 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是镜头</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> f </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值即指镜头之明亮度。镜头规格中所显示＜最大口径比</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">1:1.2</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">＞之＜</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">1.2</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">＞即为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值。</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值越小表示镜头之明亮度越高。</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值每缩小一级距，明亮度即增加两倍。镜头之射入光量与光束之断面积</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">[</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">镜头的有效口径</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">[d]</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">的平方</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">]</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">成比例，因此影像明亮度为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值平方之反比。由此推算，</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值每缩小一级距，明亮度即增加两倍。</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 7 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是镜头的光圈？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">光圈的功能就如同我们人类眼睛的虹蟆，主要用来调整摄像机的进光量，</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">表示镜头的孔径，较小的</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">f</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">值表示较大的光圈</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 8 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是景深？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">当某一物体聚焦清晰时，从该物体前面的某一段距离到其后面的某一段距离内的所有景物也都当清晰的。焦点相当清晰的这段从前到后的距离就叫做景深</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 9 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是广角镜头？（</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">wide angle</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">）</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">广角镜头因焦距非常短，所以投射到底片上的景物就变小了扩阔镜头拍摄角度，除可拍摄更多景物，更能在狭窄的环境下拍摄出宽阔角度的影像。视角</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">90</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">度以上，观察范围较大，近处图像有变形。</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 10 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是长焦镜头？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">视角</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">20</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">度以内，焦距可达几十毫米或上百毫米</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp;&nbsp;11 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是变焦镜头？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">镜头焦距连续可变，焦距可以从广角变到长焦，焦距越长成像越大。</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 12 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是光学变焦？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">是依光学镜头结构来实现变焦，就是通过镜片移动来放大与缩小需要拍摄的景物，光学变焦倍数越大，能拍摄的景物就越远</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 13 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是三可变镜头？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">光圈、聚焦、焦距均需人为调节</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 14 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是二可变镜头？</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)<br/>&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">答：</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">通常是自动光圈镜头，而聚焦和焦距需人为调节</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><br/>&nbsp; 15 </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">什么是镜头的视频驱动？（</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">video driver)——(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">难度</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">:</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">容易</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)</span>

<p>学会这些，就有了接项目最基础的知识</p>

学习

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<div id="textstyle_19" style="FONT-SIZE: 9pt; OVERFLOW: hidden; WORD-BREAK: break-all; TEXT-INDENT: 24px; WORD-WRAP: break-word">谢谢楼主，学习 </div></td></tr></tbody></table>

多谢，受教了

谢谢楼主，受教了

顶客在此！专业!

<p>又长点知识了&nbsp;&nbsp;&nbsp; 谢了</p>
<p>&nbsp;</p>

谢谢，分享

谢谢，分享

谢谢学习

学习学习~稳固基础

&nbsp;最后一个好像忘发答案了^_^

学习 了非常感谢

<p>学习，非常感谢</p>
<p>&nbsp;</p>

学习了

学习了，谢谢楼主

学习了

为了一百分，顶！

顶