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font-family: 微軟雅黑, 'Microsoft YaHei';">視角范圍計算是有公式的，當知道鏡頭的焦距、CCD尺寸，監控范圍的角度就可以推算出來。鏡頭在監控視角方面存在這樣的規律：焦距越大，監控得越遠，視角就越小;焦距越小，監控距離就越近，視角范圍就越大，焦距和視角是成反比關系的。如在一些有手動變焦鏡頭需求的項目中，視角范圍是Z先需要考慮的因素，所以一般會根據視角范圍來確定所選監控攝像機的焦距范圍。電動變焦鏡頭因為是可以根據現場環境隨時用鍵盤控制變焦、聚焦的，所以視角范圍是不太需要考慮的。但是當電動變焦鏡頭的起始焦距過大(比如起始焦距超過20mm)時，是無法實現大范圍監控的。</span></p><p><span style="font-size: 14px; font-family: 微軟雅黑, 'Microsoft YaHei';"><br/></span></p><p><span style="font-size: 14px; font-family: 微軟雅黑, 'Microsoft YaHei';"></span></p><p style="text-align: center"><img src="/data/upload/image/20160714/1468471919876384.jpg" title="沈陽?？怂箶z像頭" alt="沈陽?？怂箶z像頭" width="300" height="287" border="0" vspace="0" style="width: 300px; height: 287px;"/></p><p><span style="font-size: 14px; font-family: 微軟雅黑, 'Microsoft YaHei';"></span><br/></p><p><br/></p></div> <h3 class="tag">相關標簽：<a href="http://www.soyfriends.com/tag/%E7%A6%8F%E5%85%8B%E6%96%AF%E6%91%84%E5%83%8F%E5%A4%B4">?？怂箶z像頭</a> </h3> <div class="page">上一篇：<a 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