Is anyone using a 300mm 2.8 EF or 400mm 2.8 EF lens with adaptor and R3 or R5 mirrorless camera? Wondering if there are focusing issues associated with using the adaptor?
Thanks for the info. I'm looking to purchase a used EF 300mm 2.8 or 400mm 2.8 lens for sports photography as a more affordable option to an RF lens to use with my r3 and r5 cameras. I don't generally use focus preset, so it's not a deal breaker!
