I personally use this adapter to attach EF to my Fotofox Leica M close focus adapter. Allowing all my other Jupiter lenses to become macro lenses, as do all my Rangefinder Jupiter lenses when I connect an L39-Leica M threaded to a lens, but connected to the adapter/mount! Renters may also rent it to attach EF lenses to their Leica camera!! Lenses that can be used with this adapter [full sets branch into smaller sets]: Anamorphic Mimic Set (Blue) (EF) ($99) - https://www.sharegrid.com/losangeles/l/116385?type=rent Anamorphic Mimics Set (Orange) (PL; adaptable to EF) - ($99) - https://www.sharegrid.com/losangeles/l/123550?type=rent Anamorphic Mimic (Black) (EF) ($29) - https://www.sharegrid.com/losangeles/l/79613?type=rent Canon FD (EF) ($179) - https://www.sharegrid.com/losangeles/l/161907?type=rent Helios Set (EF) ($99) - https://www.sharegrid.com/losangeles/l/146716?type=rent Jupiter Set (EF; Full Frame and Short Flange cameras) ($99) - https://www.sharegrid.com/losangeles/l/123549?type=rent Kiev-60 Set (PL or EF) ($99) - https://filmlensaddict.com/product-category/pl-or-ef-kiev-60-medium-format-lenses/ Mir Set (EF) ($89) - https://www.sharegrid.com/losangeles/l/123547?type=rent Rokinon Set (EF) ($59) - https://www.sharegrid.com/losangeles/l/111209?type=rent Zenitar/Zuiko (EF) ($129) - https://www.sharegrid.com/losangeles/l/134249?type=rent The close focus adapter (for rangefinders) can be rented here: Leica M Lens to Sony NEX Mount (Close Focus) (Non-Electronic) ($11) - https://www.sharegrid.com/losangeles/l/139024?type=rent Other EF adapters can be rented here: Speedbooster (EF Lens to Micro 4/3) [0.71X & 0.64X] ($19 / $25) - https://www.sharegrid.com/losangeles/l/172513?type=rent PL Lens to EF Mount ($10) - https://www.sharegrid.com/losangeles/l/144792?type=rent EF Lens to Canon RF Mount (Non-Electronic / Electronic) ($5 / $25) - https://www.sharegrid.com/losangeles/l/145663?type=rent EF Lens to Sony NEX Mount (Non-Electronic / Electronic) ($5 / $25) - https://www.sharegrid.com/losangeles/l/144787?type=rent EF Lens to Micro 4/3 Mount (Non-Electronic / Speedbooster) ($5 / $19 / $25) - https://www.sharegrid.com/losangeles/l/144796?type=rent EF Lens to Nikon F Mount (Non-Electronic) ($5) - https://www.sharegrid.com/losangeles/l/85694?type=rent EF Lens to Nikon Z Mount (Non-Electronic) ($10) - https://www.sharegrid.com/losangeles/l/144797?type=rent From my collection! This is for using with the Jupiter set as an option to mount your ef lenses to the close focus adapter so they too can be macro lenses!