Features 1,Main Parameters: CS mount lens, resolution 3MP, focal length 4.0mm, format 1 or 2in, relative aperture 1.2, field of view 76 degrees. 2,Easy to Focus: The focusing ring, which is easy to hold, provides very accurate focusing for recordings. 3,High Image Clarity: CCTV lens has manual focus and adjustable aperture, no lens shadow, no vignetting, good image quality. 4,Premium Material: aluminum alloy shell, temperature resistance, can adapt to different outdoor environments. 5,Wide Application: CS mount lens can get more clarity, focus, suitable for home security system and video surveillance etc. Specification Item Type: CS Lens Material: Aluminum alloy Focal Length: Approx. 4.0mm or 0.16in Format: 1 or 2in Relative Aperture (D or f'): 1.2 Interface (Mount): CS Field Of View: 76° Back Focal Length: Approx. 12.5mm or 0.49in Aperture: Manual or Lock (W or Lock) Resolution: 3MP Close Up Distance: Approx. 0.2m or 0.66ft Size: Approx. 30x32mm or 1.18x1.26in Package List 1 x CS Lens Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.