Would you take advice from a cartoons stuffed toy?
- Jan 29, 2011
Not necessarily, as there is no moving mirror there is nothing to stop the lens rear element protruding well behind the mount, as in the Leica designs. The shutter in the R is probably no more the a couple of mm forward of the sensor so potentially 15mm of recess is possible, this would mean even a 10mm focal length design could be made that wasn't a retrofocus. That is probably too much but I can see a focal length of 14mm non retro focal being very possible.Since the R mount has a registration distance of 20mm, anything wider than 20mm (more practically, around 24mm or so) would still need to use a retrofocus design.