The simplest CCTV lens is a piece of glass (or plastic) to focus the light from the outside world onto the camera's imaging sensor. This lens' only
adjustable mechanism is its focus-ring, part of the barrel body, which you turn until your image is as clear as possible.Range of diameter | Dia. 0.7mm-Dia. 400mm |
Range of curve radius | R1.5-R∞ etc. |
Tolerance of diameter | +/-0.1, +/-0.01, +/-0.005 etc. |
Surface accuracy | Λ, 1/2λ, 1/4λ, 1/10λ etc. |
Tolerance of Thickness | +/-0.1, +/-0.05, +/-0.01 etc. |
Centration | +/-2′, +/-1′ etc. |
Aperture N | 5, 1 etc. |
Irregularity ΔN | 2, 1, 0.5, 0.2 etc. |
Surface quality | 60/40, 40/20, 20/10, 10/5 etc. |