Originally posted by rawr If I was the Sigma CEO ... after reading this thread, I'd be inclined to never, ever make a K-mount lens again.
It actually seems like they've been going in that direction in the last couple years after being the last hold-out to keep supplying K-mount with new lenses. Some of their exciting new lenses, like the improved 50mm 1.4, have not been released in K-mount.
And I don't blame them since some people on this forum will look at something like Sigma's very generous warranty and point that out as proof that their lenses must be sub-par. And now that we finally have a FF Pentax DSLR, the timing couldn't be worse for Pentax users.
Originally posted by UncleVanya You suggest that the lenses being larger means the part must be thicker and IGNORE the reports of eccentricity and the fact that this only impacts some of the lenses of these models and then due to the fact that it is not ROUND.
I didn't "IGNORE" anything. If there's been some kind of extensive study demonstrating that Sigma lenses tend to have non-round mounts, while Pentax lenses do not, then I must have missed it. I haven't been spending as much time on the forum since I went to a dual Pentax/m43 system and my m43 camera became my main walk-around.
If you want to send me a link for the reports you are talking about, then I would be happy to take a look at them, and compare my own Sigma lenses.