i bought this with a mirrorless viltrox ef-eos m lens adapter, it didnt fit my eos 600d then realised the adaptor was for mirrorless (customer) didnt know, so took it off, screwed to my camera and worked fine but then noticed only on manual focus, auto focus didnt seem to focus. took to a camera shop and they said seemed like dust or dirt on the lense motor hence not auto focusing, so selling the lense with the adaptor as faulty. you can feel it is a little stiff when using manually so sold as is , spares repairs or use as a manual. no returns
