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 for 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 for 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 for 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 for 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 etcT2 for Olympus/Panasonic Micro 4/3 Mount ,Compatible with Micro 4/3 Mount Camera: Compatible with 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 Compatible with 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