[wim]

You have no basis for what you wrote there, to be frank. 

Again, annoying to have to repeat this, but the Eg-S screen does NOT need "calibration" by shims in a 6D, nor do other Eg screens. There are no shims in Canon DSLRs for that purpose, so the notion that new cameras would need the focus screen calibrated is a bit odd? The manufacturing tolerances are high enough to make sure that every screen has the same thickness, every screen sits the same optical distance from the mount.

 

The Eg-S in my 6D makes it much faster to judge focus with big aperture shallow DOF lenses with for instance  f1.2 on FF (that would be f0.6 on MFT) than with focus peaking. Depending on the state of one's eyes, of course  :wacko:

I haven't checked any bodies since the 50D, but certainly up to that time Canon dslrs did need shims for the correct positioning of focusing screens, whether that is to position the screens which are fixed or the frames which hold exchageable screens.


I actually had some fixed focusing screens replaced with 3rd party ones, for more accurate MF ....


Kind regards, Wim