Originally posted by kadajawi compatible with the K-mount... i.e. you could mount a K-mount lens, with the disadvantage of the lens not working the way it was supposed to. Pentax will then have to provide a simple adapter that just increases the registration distance, transmitting everything else, including the screw drive AF pin.
This way buyers can make use of the short registration distance by mounting all sorts of lenses on the camera (think people coming from Canon or Nikon), Pentax can make use of the short registration distance with new lenses designed for this, and it all still works with our old lenses.
I looked at buying a Canon EOS-M. It comes with an adapter for EF lenses, BUT the performance of EF lenses on the EOS-M is atrocious ! (Just search youtube). Sony's A7 range can come with either the A-mount adaper, or Canon EF adapter (plus Nikon etc no AF). But the EF leses perform terribly on the A7 (Just search youtube). The Sony A-mount adapter for the A7 has the translucent mirror in the adapter and a Phase detect sensor - which means you lose 30% light, and your A7 becomes an SLT (real bad low light performance) ..............
After all my research, companies that have existing SLR ranges, do not provide proper backwards compatibility to their new Mirrorless camera range. They are forcing you to buy the native mirrorless lenses. Now those lens ranges are small and very expensive ...........
Which begs the question, what will Pentax do. With the K-01 we had true backwards compatibility, and fairly ordinary AF speed. I think it was a good camera, just a bit ugly. If Pentax turns the the K-S1 into a mirrorless camera, and offer a new lens mount, I doubt we'll get the full backwards compatibility with an adapter. So Perhaps the K-01 wasn't so bad after all.
So if the SLR manufacturers are scared of ruining their SLR business, by making their own mirrorless cameras, then they're actually ruining their own business. If the EOS-M, had have had real good auto focus, I would have bought it for the access to EF lenses.
So if Pentax makes a mirrorless camera again, then they'd better embrace backwards compatibility - this is a mistake of Sony and Canon.
Mirrorless and SLR's cameras have to coexist together in harmony (yes I know that was clichéd). But literally that is the problem. Pentax, Canon and Sony are afraid of mirrorless because it will cause their SLR business losses. But at least if they offered proper backwards compatibility, they won't lose business to Fujifilm.
For me, if I get a mirrorless camera, its either going to be a Fujifilm or a K-01. With a fujifilm, its got a pretty good lens line up, and good AF speed. With the K-01 I'll have a slower AF, and can use my existing lenses, but at least I didn't throw away extra money duplicating on Canon or fuji gear.
But maybe Ricoh might throw its hat in the ring, and transform the GR with a new lens mount - now I'd like to see that (and a K-02 !).