Description: This lens is a high resolution multispectral CCTV lens very much used in highly demanding environment of macro photography and industrial/cine work. It has no iris and no focus ring. It is just a fixed high resolution CCTV lens that you can use in astronomy projects with BIG sensors. It will produce some vignetting in 4/3" detectors. It works without vignetting 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. Remember this is CS mount, and you will need a short focus distance of 12mm from back of lens to sensor. IRIS/DIAPHRAGM is PRESENT; You can provide 1-6v DC current and it will close or open (reverse polarity). Resolution and contrast are gorgeous!!