Schneider Kreuznach CCTV High Resolution, IR compensated, Fast 8mm / F1.4 (400-1000nm multispectral design) CAT # 18928 Description: This 2/3" C-Mount lens is a high end CCTV lens very much used in highly demanding environment of macro photography and industrial/cine work. This lens originally had video signal iris and iris filter, but they have been removed. It has manual focus, which extends beyond the normal focus range found in C mount lenses. It will produce vignetting in 4/3" detectors. Last picture shows it working on a 2200x3000 pixel (3,5um cell size) 10,51x7,74mm CMOS chip (specifically, Cypress IBIS4-6600), so you are guaranteed 2/3" compatibility with no vignetting and even beyond. More info: They are designed for high resolution work (contrast is just amazing) and for a spectral range of 400-1000 nm (IR compensated), which means and can be used in the visible and near infrared range, practically without focus difference. The high optical performance is achieved by a sophisticated optical design and the use of ultra low dispersion glass. A special broadband coating reduces stray light and increases transmission over the whole spectral range. In my tests with slanted edge method, these Schneider Cinegon/Xenoplan broadband lenses are among the top winners always. Original cost about 1700. Very high end glass! For those of you nerd coatings experts, at the back lens produces light purple/green reflections and at the back it has strange yellowish/green reflection. Issues: none! Tested video iris works like a charm!