TAMRON Japan J12VM1040ASI ASPHERIC CCTV lens 10-40mm F1.4 (C 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. ASPHERIC lenses means sharp razor images. It is a manual cctv lens with all controls manual. 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). Includes mounting instructions. Amazing results in testing software (IMATEST), making it ideal for METEOR and UFO work or simply security. SPECS according to instruction manual: (see last pic)