Originally posted by pathdoc There's probably a lot more circuitry in a digital body. Shake reduction motors to move the sensor appropriately. Rear LED screen. Input/output leads to the HDMI, microphone, etc. That sort of thing.
There is a lot of new circuitry in a DSLR that is not present in a film SLR, but most, if not all, of what you mentioned is in the back of the body, not in the front near the lens mount. By the same token, one could argue that there is less space in the back of a film body due to the film compartment, take-up spool, and the film handling mechanics that one would find in a body like the ZX-5N. What I am wondering is: what is different that would take the space where the aperture-coupler would be specifically? The most obvious thing there is the AF motor and related mechanics, but that is present on both late film SLRs (that have the coupler) and DSLRs.
Originally posted by Imp Here you go - Pentax K-5 IIs
I think we would need a horizontal cut to get a good look at the place the coupler would be. That is a cool picture though!
---------- Post added 01-28-16 at 04:32 PM ----------
Originally posted by Imp Here you go - Pentax K-5 IIs
On second-thought, something does jump-out at me from this picture. The smaller sensor and mirror need to be centered in the existing lens mount. This leads the pentaprism to be lower to align with the mirror. Thus, the pentaprism is closer to the lens mount at the top. If they wanted to keep having a ring around the mount to implement the aperture-coupler, it might to too tight at that point. This could be good news for the FF since all of those things would be back in their 35mm places with respect to the mount.