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镜头计算工具
CCD传感器尺寸：
1/4 inch
1/3 inch
1/2 inch
镜头到目标距离：
单位：
Meters
Feet
Inches
mm
目标区宽度：
单位：
Meters
Feet
Inches
mm
需要的镜头：
需要的镜头尺寸（焦距）
毫米
视野
°
（度）
