mackguyver said:
This might surprise some of you, but I actually chose the 60D over the 7D primarily because it allows interchangeable focus screens and I wanted the precision matte screen. I have the 24L, 50L, 135L and wanted more accurate focus confirmation and DOF preview (not just manual focus) and can't get that with the 7D. It's also nice on the 2.8L zooms, of course.
If you are interchanging focus screens, you might want MA. Some focus screens require shimming to get the viewfinder focus accurate when you are using manual focus. doesn't matter to AF, just manual focus.
hopefully, you won't run into that, but some who actually check do have issues.
The focus screen of the 7D is replacable, its just more work. You certainly would not want to change them back and forth, and its for those who have a bit of a mechanical aptitude, since it requires a screwdriver and tweeker. You can buy them here: http://www.katzeyeoptics.com/item--Canon-7D-Focusing-Screen--prod_7D.html
Instructions:
http://www.katzeyeoptics.com/files/install_12.pdf
