Opteka 500mm f/6.3 (with 2x- 1000mm) Telephoto Mirror Lens for Digital SLR Cameras

  ADVANCED OPTICS: Featuring an optimized design, this lens uses mirrors and a series of 7 optical glass elements in 6 groups to reduce chromatic and spherical aberrations. A anti-reflective coating suppresses lens flare and ghosting for increased contrast and color fidelity. SUPER ZOOM: Manual focus 500mm or 1000mm with the 2x converter, this lens is not only a superb long range choice, but also performs well in a variety of scenes from sports and surveillance to everyday shooting. SOLID CONSTRUCTION: Full metal body and rear mount allow this lens to withstand wear and tear much better than plastic lenses while commanding a rugged, solid feel when using. COMPACT AND LIGHTWEIGHT: Mirrors allows this lens to be much shorter than it would need to be without the mirrors. At 4.7-inches long, this 500mm f/6.3 is one of the shortest telephoto lenses currently available. COMPATIBILITY: Can be used on all Digital SLR Cameras.   The Opteka mirror lens is incredibly compact and lightwe