i am on my 2nd one and soon to be 3rd one. the camera shop owner isn't going to be happy and claims that RMA's need to be run thru canon and required permission from the canon rep to exchange it. (i would love someone in the know to tell me if this is true, as i bet he is going to freak when i come back and tell him that this 2nd one is garbage too and will try to make me go to canon which after only a month of ownership - total 1 month on two cameras return to factory is rubbish and i wont talorate it.)
anyways. my first one was fine for a couple of weeks, dead on... theni bought the 85mm 1.8 and all hell broke loose, instantly bad focus, no matter what i did, manual focus was shot but contrast based live view was 100% dead on (i know, two very very different focusing systems)
i even took it to the shop and showed him on a tripod repeatedly how "thru the lens" focusing was not working.
so i picked up the 2nd one the next day... same thing but much less.... but i figured i would give it a try and see what happens.
so far its really hit and miss but more miss than hit.
it is also now not focusing correctly with my 50mm 1.8 nor my Sigma 28-70 2.8.
an old 24mm 2.8 macro by quantarray (tech-10) works fine last i tried it.
i also noticed purple/green fringing with my 50mm 1.8 which never EVER happened on my 40D, 20D, XSi or Xti. but its happening now with my 7D.
anyways i am really afraid the store owner is going to tell me to piss off and call canon, he wouldn't do that he is a decent guy, but has a business to run. and i frankly will do the canon repair thing if i have to but with less than 600 shots on this new one... what do i do?
so to sum it all up.
the first 2 weeks were great,, nothing but great shots, low light or day light, any lens.
then, i get the 85mm 1.8 and it pretty much just screws the camera up,, not sure how, but it did. it doesnt even work right on my XSi. and now not even my 50mm works right on my XSi...
2nd camera isnt nearly as bad but still has issue focusing and will probably go back.