Originally posted by Anvh Shall i tell you something better, they can most likely make a M-mount DSLR with APS-C sensor, so with optical viewfinder and a flipping mirror.
it will be a tight fit though...
Impossible; the M mount does not allow room for the mirror, because it's a rangefinder mount, with rangefinder registration distance.
It seems to me you lack basic knowledge on this matter, yet you're very opinionated and refuse to acknowledge all the arguments you're shown.
The 4/3 and m4/3 are intentionally very similar, except for the registration distance. They're full-electric mounts, so an adapter is just an extension tube with electrical contacts.
OTOH, the K-mount is partially mechanical, with its aperture lever and screw drive AF; it also combines the legacy A contacts with digital information transfer. But we're in a.d. 2012, so the just-because mount would be, naturally, full-electric, full-digital.
In other words, it's more similar with what Sony had to do. Yet you chose the simplest, cheapest adapter. Even better, you decide that Pentax should give it for free, just to "silence" the price argument against your stupid mount.
By the way, many people are complaining about AF speed when adapting 4/3 lenses to m4/3 cameras. I assume Sony had the same problem, solving it by including a PD-AF system in their adapter.