Right, the lack of support has nothing to do with K-mount itself. I never meant to imply that. I have no problems with the K-mount. God bless the K-mount...
Voightlander, Zeiss, Tamron, and Sigma have either abandoned or limited their K-mount offerings. This may be a problem for current Pentax users. This is a problem for the K-mount.
I used to believe that in-body SR was the issue, too, but it's not. Non-stabilized versions are still made for Sony. Sigma, for example, keeps optical stabilization on their K-mount 70-200/2.8 HSM, leaving the user to decide which to disable.
Originally posted by Lowell Goudge The dwindling "support" for the K mount with third party lens makers is not specifically a K mount issue. I see no real difference in technology between nikon, sony and pentax bayonets. all roughly same size etc. What I suspect the issue is, is one of the introduction of optical stabilization by third party makers, which may or not be attractive to pentax and also sony users, who have in body stabilization.