This seems like a typical S-Mount (M12x0.5mm) lens. Most of those assembled to webcams are crap (cheaply built, not applicable for megapixel resolutions) and probably not well-suited for 1/2.5" 5MP sensor anyway. Try http://lensation.de/cms/index.php?op...cchk=1&lang=de or http://www.lechner-cctv.de/board-cam...-5-.75.en.html to evaluate some of the better ones.