Thanks John; I'm a cinematographer so understand the importance of back focus. My issue is that the store advertises a Sony E-Mount as well as an M-48 adapter so, despite the e-mount being listed as specifically for my camera, the guy I spoke to said it "wasn't but [I'd] need something to sort out the back focus" which of course I know but he couldn't tell me what I needed to do it! So, I understand and thank you for your reply John but, I can't be the only person that has wanted to put this camera on a scope so what, specifically, do I need to do it? Is there anyone out there that has done this, e.g. this thread's creator? Many thanks, Steve.