• Use for many versatile applications due to broad focal length adjustment range
• Ultra wide 2.8mm view to telephoto 11.5mm
• Built-in DC auto iris provides automatic adjustments when lighting conditions change
• Compatible with ALL CS-mount 1/3" CCD video cameras

The CSL-312A can be used to provide a dynamic field of view control between 2.8mm and 11.5mm focal lengths. It should be noted that the picture will have an "artifically" wide field of view with some curvarture of the video image for any focal length setting wider than roughly 5.0mm. Unfortunately, there is NO way to provide such a wide viewing angle without this type of distortion. The distortion disappears when the lens is adjusted to a more narrow field of view.

This is a varifocal zoom lens, and all lens adjustments must be made manually by hand. Once the desired focal length is acheived, the lens has thumb screws which tighten to maintain that specific focal length. We also carry fixed focus C-mount lenses for those applications where desired.

The CSL-312A employs voltage from the camera's auto-iris port to automatically adjust the amount of light which passes through the lens optical glass and reaches the imager. This feature allows for brilliant lighting in many diverse and changing lighting conditions. However, its extra light gain sensitivity can make the video image too bright under certain direct forward lighting circumstances. When room illumination is likely to remain constant, a manual iris lens in fact offers better overall image quality in many situations. For these types of camera installations, we also carry the CSL-312M.

This lens has a security-industry standard CS-mount lens thread, making it compatible with the following Eyespyvideo.com models: TV-CSHRL, TV-CSHR, TV-CSHDN, and TV-BCSHR. The auto-iris port on these cameras provides seamlessly compatibilty with the CSL-312A. However, this lens is NOT compatible with the special auto-iris port built into the TV-XCS model camera. We offer a variation of the CSL-312A for this camera, our CSL-312X.

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