Bower T-Mount 500mm f/8 Mirror Telephoto Lens with Case, Skylight, Neutral Density 2

Fixed-aperture 500mm f/8 mirror lens in T-mountMulticoated opticsDistinct out-of-focus highlight characterizationExcellent close focusing capacityAccepts 30.5mm filters at rear of lens barrel
Product DescriptionThe Bower 500mm f/8. 0 Manual Focus Lens is a catadioptric mirror T-mount lens, precision manufactured in South Korea. When combined with the T-mount to fit your camera system, this mirror lens mounts to camera and works on both "full frame" cameras as well as the "APS-C" style

Source: Digital Camera and Video Store...