Adapter guide
Konica AR lenses on Canon RF
Yes, this works. Konica AR has a 40.5mm flange distance and Canon RF mount has 20mm, so a 20.5mm mechanical adapter with no glass fills the gap and infinity focus is preserved. Focus and aperture stay manual.
- Konica AR flange
- 40.5 mm
- Canon RF flange
- 20 mm
- Adapter thickness
- 20.5 mm
- Optical elements
- None required
Setting it up
Enable Release shutter w/o lens and turn on MF peaking. Canon APS-C bodies use a 1.6x crop rather than the 1.5x of other systems.
Automatic diaphragm with an AE (later EE) lock position on the aperture ring for shutter-priority bodies. Press the lock button and move the ring off AE to use the aperture manually.
Konica AR lenses and their field of view on Canon RF
Effective focal length changes with sensor size. The lens itself does not change; the smaller sensor simply captures a narrower part of the image circle.
| Lens | Focal length | Aperture | Full frame | Frames like (APS-C (1.6x)) | Years | Used value |
|---|---|---|---|---|---|---|
| Konica Hexanon AR 50mm f/1.7 | 50mm | f/1.7 | 50mm | 80mm | 1965-1980s | $40 to $150 |
| Konica Hexanon AR 57mm f/1.2 | 57mm | f/1.2 | 57mm | 91mm | 1965-1970s | $500 to $1,600 |
Frequently asked
Do Konica AR lenses work on Canon RF cameras?
Yes. A plain Konica AR to Canon RF adapter works with no optics. Konica AR has a 40.5mm register and Canon RF mount has a 20mm register, so the adapter is a 20.5mm tube that puts the lens exactly where a Konica AR body would. Plain adapter ring. The 40.5mm register is the shortest of the classic 35mm SLR mounts, so AR lenses adapt to mirrorless but cannot reach infinity on any DSLR.
Do Konica AR lenses focus to infinity on Canon RF?
Yes. Because the adapter restores the native 40.5mm register, infinity focus is preserved and the full focus scale on the lens stays accurate. Adapters machined slightly short let the lens focus past infinity by a small margin, which is harmless; adapters machined long stop short of infinity, so buy from a maker with tight tolerances.
What focal length does a Konica AR lens become on Canon RF?
On full frame Canon RF bodies (EOS R, RP, R3, R5, R6, R8) the focal length is unchanged: a 50mm lens frames as a 50mm. On APS-C (1.6x) Canon RF bodies (EOS R7, R10, R50, R100) a 50mm lens frames like a 80mm lens on full frame; the aperture and depth of field at a given distance do not change.
More on this mount: Konica AR mount reference