500mm f/8.0 Manual Focus Telephoto Mirror Lens For Canon EOS Rebel T6, T6s, T6i, SL1, T5, T5i, T4i, T3, T3i, T3i, 70D, 60D, 60Da, 50D, 40D, 30D, 20D, 10D, 1D, 5D, 5DS, 5DS R, 6D, 7D Digital SLR Camera Perfect for Wildlife, Travel, Nature, Sports, Animal, and Landscape Photography. It is also used for cityscapes, celestial photography and multiple general photography applications. It's lightweight (12.7 oz/360 g) and compact (under 3.5" long) and it focuses as close as 5.6' (1.7m). The aperture is fixed at f/8.0. It's recommended to use with a tripod. Construction: 7 elements in 6 groups. Powerful addition to any photographer's kit bag.