Originally posted by Winder The Sigma 150mm macro was listed on Adorama for the Pentax mount. They said they would ship it as soon as it became available. But it is no longer listed. I was watching that lens. The non-OS version was very sharp. I used it on my E-3 a couple of times and was very impressed.
I hope it is offered in the K-mount. There is rumor of a Sigma 135mm f/2 next year.
I'm not so sure about the difference between the OS and non-OS version would be in terms of IQ, but if the OS appears to perform evidently better at the infinity end, it would be really worth the additional cost. one could easily acquire the Non-OS version for half the cost of the new one.
as far as 135mm rumor is concerned, the Samsung 135/2 seems to be more close to reality than a Sigma.