M42 Screw Mount SLR Lens to Canon EOS Mount SLR Camera Body Adapter – Fotodiox, Inc. USA
Amazon.com : FocusFoto 9th Gen AF Confirm Adapter for M42 Screw Mount Lens to Canon EOS EF EF-S Mount Camera 80D 77D 70D 60D 5D Mark II III 5D2 5D3 7D 6D
FotodioX M42 Lens to Canon RF-Mount Camera Pro Lens M42-EOSR-PRO
What use have the AF confirm chip on this M42 adapter. : r/canon
Replacement M42-FD Camera Lens Mount Adapter For Canon FD TO M42 Mount Camera | eBay
K&F Concept M10131 M42 Lenses to Canon EF Lens Mount Adapter - KENTFAITH
Amazon.com : Fotasy Adjustable M42 Lens to Cannon EF-M Mount Adapter, M42 EFM, M42 EOS M Adapter, Compatible with Canon EF M Mount Mirrorless Cameras EOS M M1 M2 M3 M5 M6