High-Power 500mm f/8.0 Telephoto Mirror Lens + 2x (doubles the zoom to 1000mm) for Canon Digital EOS Rebel T1i, T2i, T3, T3i, T4i, T5i, SL1, EOS 60D, EOS 70D, EOS 80D, 50D, 40D, 30D, EOS 5D, EOS1D, EOS5D III, EOS 6D, EOS 7D Digital SLR Cameras High-power 500mm telephoto focal length Minimum focusing distance of 5.75 feet Construction: 7 elements in 6 groups Super lightweight and compact for easy travel and usability