VISTA Japan HIGH END LUXURY CCTV lens VISTA VA4V1212IRP-100 (CS Mount) Description: this is nice quality IR compensated lens (focuses at same point IR light and visible light IR) and it is good for cameras without IR filter for right focus when night falls and IR monochrome mode in camera activates. It is a manual cctv lens with some controls manual (zoom and focus) and some automatic (iris, which is AI type). Iris can be removed if you are a bit handy. Designed for 1/2" CCD or smaller (otherwise it may cause some vignetting at corners, though at tele positions usually vignetting is reduced or even eliminated as long as sensor is not much bigger than 1/2"). C mount (17,5mm back focus distance). Amazing results in testing software (IMATEST), making it ideal for METEOR and UFO work or simply security. This is a high end lens in the CCTV lens world. SPECS according to online manual: (SEE LAST PIC).