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, Compatihle 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