Originally posted by blende8 But with film in those days this was not such an important issue compared to today with 100% view.
I do print of negatives up to 30x45 cm and i'm going to try something bigger from 6x7 neg, and i can assure you that critical focusing is as much important as if it was taken with a DSLR.
The idea that film can allow you to have less focus image be perfectly fine when blow up is just a fantasy, according to my experience.
The focusing was easier on film camera because those who created the camera, also created the various screen within specifications, and THAT allowed fine focusing possible. Katzeye and focusingscreen.com do great job at shiming screen for various brand of DSLR, but the thickness of those screen isn't the same as the OEM one, hence, creating some focus shift under some circumstances. And that is a pain.
If a brand wants to really kill EVF, just bring some easy to swap, and very high quality, focusing screen, and that's it ! Friends of mine, who never used film camera did a fantastic job at nailing shoots on a 67 / and 135mm SuperA.