+3.00 mm
Space for the adapter
47.00 mm
Leica R flange
44.00 mm
Canon EF flange
Verdict: Yes — a simple 3.0 mm adapter keeps infinity focus.
What to expect#
Aperture control: these are mechanical lenses with aperture rings — set the aperture on the lens and shoot in aperture-priority or manual.
Focus: use focus peaking and magnification in the viewfinder. Exposure metering works normally because the camera meters through the lens at working aperture.
Canon EF cameras#
- Canon EOS-1D X Mark III 2020
- Canon EOS 6D Mark II 2017
- Canon EOS 5D Mark IV 2016
- Canon EOS-1D X Mark II 2016
- Canon EOS 5DS 2015
- Canon EOS 5DS R 2015
- Blackmagic Design Pocket Cinema Camera 2013
- Canon EOS 5D Mark III 2012
- Canon EOS 6D 2012
- Canon EOS-1D X 2012
- Canon EOS-1D C 2012
- Canon EOS-1D Mark IV 2009
- Canon EOS 5D Mark II 2008
- Canon EOS-1Ds Mark III 2007
- Canon EOS-1D Mark III 2007
- Canon EOS 5D 2005
- Canon EOS-1Ds Mark II 2004
- Kodak DCS Pro SLR/c 2004
Other systems for Leica R lenses#
Frequently asked questions#
Will Leica R lenses autofocus on Canon EF?
No — adapted lenses are manual focus on this combination.
Does a Leica R to Canon EF adapter affect image quality?
A glass-free adapter is just a precisely machined spacer, so image quality is unchanged when it is built to the right thickness. Cheap adapters can be slightly too thin or thick, which shifts the infinity mark.
Last updated October 03, 2026 · How we calculate · Sources