Schneider Kreuznach CCTV High Resolution, IR compensated, Fast 17mm / F1.4 (400-1000nm multispectral design) CAT # 17-0103 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 works as originally intended with video signal iris and spot filter. It also has manual focus, which extends beyond the normal focus range found in C mount lenses. It will produce a bit of vignetting in 4/3 detectors. 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. Black is negative power, red is positive power, white is video signal. Issues: it may have some usage marks in body, but optics and iris are perfect. Though it says "Cinegon 8mm F1,4" in the front lettering (first pictures), this is Xenoplan 17mm (mistake from Schneider putting front information lettering). Technical information: HTTPS://www.eureca.de/pdf/optics/schneider/Schneider.pdf (see page 3)