The SLR Hut 55-300mm f/4.5-5.6 DT Alpha A-Mount Telephoto Zoom Lens is a 5.5x zoom lens, with 35mm equivalent of 82.5-450mm focal length. Optimized for the A-mount APS-C sized DSLR and SLT digital cameras, the 55-300mm lens that serves as an all-in-one replacement for obsolete models.