Russian Manual Focus MC3M-7K 300mm f/5.6 compact mirror telephoto lens. Made in USSR. Serial # 910028. This lens will cover FULL FRAME 35mm or digital. Lens will fit Pentax manual focus M42 cameras like Pentax SP, Pentax Spotmatic, Praktica , Yashica and all other M42 screw mount camera's. Can also be used on most mirrorless digital cameras with the proper adapter. Will also fit Pentax film or digital camera that takes Pentax K baynet mount lens like Pentax K1000, LX, ME or digital cameras like Pentax K100, K200 K30and K20 if you use the Pentax screw mount adapter. Lens aperture is fixed f/5.6.Lens uses rear filters. Minimum focus distance is 5.5 feet. or 1.7 meters. This unusual lens has a speed of f/5.6 and covers full frame35mm. Very compact 3" size. Lens is in Ex+/Ex++ or 9 of 10 cosmetic condition. No dings or dents. Clean glass with a few small dust spots inside that can be seen with a flashlight. Nice coating. This lens has been a favorite for users who desire a compact tele lenses with good BOKEH. A must have lens for your Pentax manual focus film or digital system. Lens comes original case, 5(five) filters, and rear cap. Rare lens to find. Sells with NO RESERVE at a price of 595. I have more Pentax cameras, lenses, accessories, 35mm Rangefinder cameras and lenses, Medium and Large Format cameras, on my other Auctions, web page and eBay Store.