Features: Completely old school, convert to manual control, manual focus and manual exposure, used on Lightdow/Opteka 500mm, 420-800mm, 650-1300mm Telephoto Lens & Telescopes T2-Canon EF/EOS Mount, Compatible with Canon EOS Rebel T7, T7i, T6, T6i, T5, T5i, SL2, 80D, 77D, 700D, 70D, 60D, 50D, 5D, 6D, 7D, 600D, 550D, 200D, 150D, 100D, 1300D, 1400D, 1500D etc T2-Nikon F Mount, Compatible with Nikon D850, D810, D800, D750, D700, D610, D3100, D3200, D3300, D3400, D5100, D5200, D5300, D5500, D5600, D7000, D7100, D7200, D7500, D50, D60, D90 etc T2-Sony A Mount, Compatible with Sony A99II, A99, A900, A850, A77 II, A77, A65, A58, A57, A55, A37, A35, A33, A700, A580, A560, A550, A450, A390, A380, A350, A330, A300, A290, A230, A200, A100 etc T2-Sony E Mount, Compatible with Sony A9, A7S II, A7R II, A7S, A7R, A7 II, A7, NEX-7, NEX-6, NEX-5, NEX-5N, NEX-5R, NEX-5T, NEX-3, NEX-C3, NEX-F3, NEX-3N, A6500, A6300, A6000, A5100, A5000, A3000, QX1 etc T2-Olympus/Panasonic Micro 4/3 Mount ,Compatible with Micro 4/3 Mount Camera: Panasonic Lumix DMC-GH5, DMC-GH4, DMC-GM1, DMC-GX7,DMC-G6, DMC-GF6, DMC-GH3, DMC-G5, DMC-GF5, DMC-GX1, DMC-GF3, DMC-G3, DMC-GF2, DMC-GH2, DMC-G2, DMC-G10 Olympus: OM-D E-M10, OM-D E-M1, PEN E-P5, PEN E-PL5, PEN E-PM2, OM-D E-M5, PEN E-P3, PEN E-PL3, PEN E-PM1, PEN E-PL2, PEN E-PL1s, PEN E-PL3, PEN E-PM1, PEN E-PL2, PEN E-PL1s, PEN E-PL1, PEN E-P2 Specifications: Material: Metal Color: Black Type: Screw External diameter: 42 mm Flange: 55 mm Connectors: None Package Content: 1x T-mount Adapter Ring