- With this adapter, you can use T2 T lens Telescope on EOS M mirrorless camera. - Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. - Infinity focus is guaranteed. - Material: aluminium and brass. - Lens lock / release and stop screw. - Fine finishing! Install, remove and operate lens smoothly! Suitable For: - Lens: T2 T lens Telescope. - Camera: Canon EOS M M2 M3 M5 M10 M100 M6 M50 mirrorless Camera. - This adapter doesn't fit Canon EF / EFs Mount Cameras, eg. 650D, Rebel T3i, 5D, 7D etc. Settings: - Put red marks of the adapter and lens collar together. - Use Manual or AV mode. - Open the Menu > Configuring custom functions > Others > Release shutter w/o lens > Enable.