An EOS R body can use listed EF lenses through a Canon EF-EOS R adapter; EF-M is outside that route.
Make the exact-model decision
Identify exact lens suffix, choose a verified adapter type, then check camera firmware and feature notes. Start with the camera maker’s exact body support page and the lens or adapter maker’s exact model number. Read restrictions alongside the basic fit statement.
A manufacturer example
Canon’s EOS R6 Mark II support page separates native RF/RF-S lenses from EF/EF-S lenses that require an EF-EOS R adapter and excludes EF-M from that adapter route. Use the linked page for its stated model and revision; a different model may need a different support document.
Where to draw the line
A broad mount-family claim can omit firmware, burst, crop or video-mode exceptions. Keep unlisted modes unknown. If a source does not address the exact feature you need, record that feature as unknown rather than treating silence as support or incompatibility.
Your next step
Take the model code from the body or lens label, open the official source below, and compare its scope with the equipment you have. Then use the check maker-backed results to organize what is known. Do not mount an item that resists or appears on a maker’s exclusion list.
Official sources and scope
Checked for this reference on October 30, 2026. Product firmware and support lists can change; inspect the current maker page for your exact revision.