Shenzhen Sunell Technology Corporation
Shenzhen Sunell Technology Corporation

How to judge whether it is a fixed camera or a vari focal camera?

First we can look into the appearance of the camera. Normally the dimension of camera with fix lens is less than camera with vari-focal lens. Meanwhile the vari-focal camera has auxiliary components, such as iris control, motor, gear. Secondly we can refer to specification of lens. Generally the focal length of fixed camera is a fix value, shown in the picture below:


ItemsDescriptionTolerances
Focal Length3.6mm±5%
Aperture (D/f)F2.0±5%
Image Circle1/2.7">6.9mm
Focus Range0.3m~INF


While the focal length of the vari-focal camera is a range of value, shown in the picture below:


ItemsDescriptionTolerances
F No.1.5±5%
Focal Length3.6-11mm±5%
Optical Back Focal Length6.24mm (In Air)±0.1
Mechanical Back Focal Length13.20mm (In Air)±0.1
Image Circle9


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