What is the significance of calling it a larger EF mount? Does that imply electronic compatibility...as-in you can mount one of these lenses to an EOS body with an adapter and maintain full functionality?
I think there are two parameters here - mount diameter and flange distance. I guess both would be larger, making an EF to EF-medium-format problematic.
I think you have that backwards. A lens with a larger flange diameter shouldn't be a problem mounting to an adapter that reduces to EF diameter. Sure, the full light circle wouldn't be projected, but that's fine since the 35mm sensor is smaller than MF. And the greater flange distance is fine too, the length of the adapter ensures it is positioned the correct distance from the 35mm sensor.
EDIT: To be clear, my original comment NOT talking about mounting an existing EF lens on a medium format camera. That makes NO sense at all. The original CR post says "A larger version of the EF lens mount will be created ". I wondered why would they bother calling it that unless they intend that the new lenses would remain electronically compatible with the existing EF mount, so that you could mount a medium format lens on an EF body with a simple adapter.
« Last Edit: August 19, 2013, 03:28:44 PM by bchernicoff »
5D Mk III, Elan 7e, Fuji X-E1, some old rangefinders
Tamron 24-70 2.8 VC, Canon 70-200 f/2.8L IS II, 400mm f/2.8L II, 100mm L IS Macro, Sigma 85mm, 50mm, & 35mm f/1.4's, Rokinon 14mm f/2.8, Canon 2x Extender II, Kenko 1.4x, 430 EX II, Elinchroms