12-30-2016, 07:09 AM
Having a camera without shims between focusing screen and it's housing can mean, it was on the upper edge of tolerance. So that no shim was necessary to get more or less proper focus.
Having the wrong thickness of those shims - and so far I haven't seen a model without them, except a Mamiya 645 super - means "front- or back focus. And I'm not telling this to BC, no point in wasting time to stubborn minds unable to admit ever "maybe I was wrong". So, if shims are not visible in a camera with exchangeable screens just means they are used on another place. And believe me, if a 5D has them, your cheaper 6D will not get away without. Finder, screen, mirror and sensor do have position tolerances, it's only in your world a missing part in the assembling process.
Having the wrong thickness of those shims - and so far I haven't seen a model without them, except a Mamiya 645 super - means "front- or back focus. And I'm not telling this to BC, no point in wasting time to stubborn minds unable to admit ever "maybe I was wrong". So, if shims are not visible in a camera with exchangeable screens just means they are used on another place. And believe me, if a 5D has them, your cheaper 6D will not get away without. Finder, screen, mirror and sensor do have position tolerances, it's only in your world a missing part in the assembling process.