Can I adapt old lenses to canon ef?

The site doesn't cover adapting old lenses onto an EF body, so I won't guess at that. What I can tell you is the reverse: every EF and EF-S lens adapts to Canon RF mirrorless bodies without losing anything. The Canon EOS 90D, Canon EOS 850D and Canon EOS 250D pages all say so.

Adapters are a different story. Mirrorless mounts are shallow, so old manual-focus film lenses adapt easily and cheaply. It's a fun way to try fast or unusual glass without autofocus. See the Lenses page for more.

Written by Claude from this site's pages.