Originally posted by dws1117 His flawed logic is mainly that it's old. Of course old doesn't mean that it is broken or there is anything wrong. He also thinks that since Canon has changed their mount that there must be a reason. Like I said earlier. His argument doesn't make sense.
Canon changed their mount to steal Nikon users. They had to change to eliminate the clunky breech lock as well. While they were at it they upgraded the electronics
Canon EF lens mount - Wikipedia, the free encyclopedia the EF lens mount works with adapters due to its large diameter and the relatively short flange focal distance of 44.0 mm[3]. It is possible to mount lenses using the Nikon F mount, Olympus OM, Leica R and universal M42 lens mounts (among others) by the use of a mechanical adapter
Shortening the registration distance caused a lot of extra engineering work to overcome the mirror swing
Canon FD lens mount - Wikipedia, the free encyclopedia
Pentax "backward" compatibility is a 2 edged sword...
Pentax needs to make electronic aperture couplings and better feedback/more data lenses.
The KAF mount is capable of much more but.....Unfortunately building cameras for 2 systems cuts into the profit margins.
They have started the process (no aperture rings, bodies w/out in body motors)
Pentax is risk adverse and, wisely enough, did not do a Canon surgical strike. When Canon threw the old mount out there was quite an uproar in the media and Canon users. They lost but gained in the long run.