EOS RP + EF to R Adapter + EF 1.4 Teleconverter = Err 01: Canon EOS R Talk Forum: Digital Photography Review
![Canon Err 01 - How to Fix Faulty Lens Communication!CANON ERROR 01 Killer Problem-Emergency Solution - YouTube Canon Err 01 - How to Fix Faulty Lens Communication!CANON ERROR 01 Killer Problem-Emergency Solution - YouTube](https://i.ytimg.com/vi/ZpFHVVIDgfw/maxresdefault.jpg)
Canon Err 01 - How to Fix Faulty Lens Communication!CANON ERROR 01 Killer Problem-Emergency Solution - YouTube
![17-85 err01 fix (aperture flex cable exchange): Canon SLR Lens Talk Forum: Digital Photography Review 17-85 err01 fix (aperture flex cable exchange): Canon SLR Lens Talk Forum: Digital Photography Review](https://2.img-dpreview.com/files/g/TS560x560~1704329.jpg)
17-85 err01 fix (aperture flex cable exchange): Canon SLR Lens Talk Forum: Digital Photography Review
![Err 01 Communications between the camera and lens is faulty. Clean the lens contacts Quick Fix - YouTube Err 01 Communications between the camera and lens is faulty. Clean the lens contacts Quick Fix - YouTube](https://i.ytimg.com/vi/hscED9ZYQK4/maxresdefault.jpg)
Err 01 Communications between the camera and lens is faulty. Clean the lens contacts Quick Fix - YouTube
![Any idea how to fix this? It's happening with my sigma 75-300mm lenses I haven't used it in over a year. I've cleaned it with a normal cloth by nothing is helping? : Any idea how to fix this? It's happening with my sigma 75-300mm lenses I haven't used it in over a year. I've cleaned it with a normal cloth by nothing is helping? :](https://preview.redd.it/48i1il42g2551.jpg?auto=webp&s=2905285506e2389b6cc123ea59b65e2cdcc2a0ae)