Bower  500mm f/8 Telephoto Mirror Lens For Pentax K-m K-x K-r, K-01, K-3, K-5, K-5 II, K-5 IIs, K7, K-R, K10D, K20D, K-30, K-50, K100D, K110D, K-500, K200D, K1000, K2000, *istDS2, *istDS, *istDL2, *istDL, *istD Digital SLR Cameras This 500mm Telephoto lens is perfect for Wildlife, Travel, Nature, Sports, Animal, and Landscape Photography. Who wants to be hidden while taking photos of the subject. Compact and lightweight ultra telephoto. Using an advanced reflex design, our lens is a fraction of the size and weight of a traditional 500mm. With a very short closest focusing distance of only 1.7 metres, the lens enables very good magnification. Thanks to its easy handling, the lens is also especially suitable for beginners. It comes complete with a soft pouch and three (3) rear mounted, 30.5mm filters, (ND-2X, ND-4X & Skylight). + Bonus T-mount adapter for digital and 35mm Pentax SLR cameras