Originally posted by johnmflores I've posted this before, but just to add to this discussion of relative size...
If you accept the idea that the MX in the middle is about as thin as they come, you can see that modern dSLR have gained some girth due to the added electronics of the sensor, LCD, circuitry, etc... Here's another, more telling view - small film camera vs. small dSLR, K-mount side down:
With some clever re-arrangement of components and a strict diet, Pentax might be able to develop a dSLR that rivals the size of current EVIL cameras
without the need for a new mount or adapter for existing lenses. There's no doubt that the MX is thin. Considering the film is almost at the back of the camera, it's not surprising.
The flange on Pentax is a limiting factor, at 45.5mm. I've just measured mine, and the "thin" part of the MX is about 34mm, and the part with the lens mount is about 17mm, total is around 51mm, so they only "waste" 5.5mm, which is remarkable!!! The K-x is 68mm.
If Pentax can cleverly re-arrange components and electronics, then Panasonic & Olympus should be able to do the same. The flange on micro 4/3 is 20mm. My GF1 is about 35mm thick. The limiting factor for Pentax is that the lens cannot encroach on the mirrorbox area.
The is no such constraint for micro 4/3. On the GF1, the shutter is a full 10mm from the flange, and another 10mm to the sensor. (this includes about 2.5mm for the sensor filter). So the electronics takes up another 15mm.
The Panasonic 20mm F1.7 is 25mm deep. The Olympus 17mm F2.8 is 22mm deep. If they could build a lens that RETRACTS 10mm into the body, then they could make a pancake that is only extends 10mm out of the body when not in use. Couple that with shaving 7-8mm off the body, and you could be looking at a body and lens that is only 38mm thick.
If you did the same with a Pentax, using the 40mm F2.8 Limited, shaving 13mm off the body (down to 55mm) you would still end up with a total thickness of 70mm