Wow. This thread took a turn over the last 24 hrs; arm waving, screaming and at one point I think I even saw a semi-naked woman rolling down my screen!
Originally posted by distudio LOL, plainly you're not an engineer
A scratch is interference. Interference is contact pressure. Contact pressure imparts bending moment. Bending moment creates unforeseen stress. Stress is
always accompanied by deflection.
Send it to Sigma, file the lens mount or dremel the DLSR. Personal choice, but the fundamental problem needs to be dealt with - discount and ignore at your own risk.
(In defence of distudio, I personally wouldn't dremel the body but that's just me. The cutaway image suggests the skin is cast, not pressed and the existing little groove is cold machined. His suggestion is not invalid, just dependant on operator competency and accepting some risk.)
Last edited by jawsy; 05-13-2016 at 02:43 AM.