Canon EF-S lenses on Canon RF

24 mm flange clearance full

Does a Canon EF-S lens fit a Canon RF body?

Yes, with a simple adapter and no loss of image quality. Canon EF-S has a flange focal distance of 44.0 mm and Canon RF has 20.0 mm, leaving 24.0 mm for the adapter to occupy. Because the adapter contains no glass, the lens performs exactly as it does on its native mount.

Autofocus: Full autofocus

Works exactly as EF does. The body detects the APS-C image circle and switches to crop mode automatically, so a 24 MP full-frame body yields around 9 MP. Note that EF-S lenses cannot be used on a full-frame Canon SLR at all — the rear element fouls the mirror — so mirrorless is the only way to put them on a full-frame body.

Adapters

• Canon Mount Adapter EF-EOS R — Canon (mechanical, no glass)

Flange focal distances: Canon EF-S 44.0 mm, Canon RF 20.0 mm.