A 28mm F2.8 Helios M42 screw thread lens, in exceptional condition. All optics are lovely and clear and bright, the aperture blades work beautifully, and the lens itself is in wonderful , hardly used condition. It comes with its original metal lens cap, and rear cap, AND.. its original box!! ( the box has a slightly worn look about it- but it has its original price sticker-£35.95 on it!) This lens will work with cameras that can use screw thread lenses -such as Zenit and Practica and Pentax,but it also works beautifully with digital slrs( particularly Canon eg 300d 350d, 400d etc) with a simple adaptor available on ebay for a few pounds- look for ' m42 to canon adaptor .' I have used this great lens with my canon 300d, and if you go to my website , www.richedwardsmusic.com The HDR (high dynamic range) photos, of Bristol, the Clifton Suspension Bridge, Ashton Court, and Bristol Cathedral, have all been taken with this lens. So as you can see, it works a treat! Thanks for looking! Rich.