Originally posted by C_Jones I have a Sigma 150-500 DG OS that I still use. It was what I purchased prior to when the Pentax 150-450 was available. As for lens availability from Pentax, I am very satisfied with the selection, and have both the Pentax 16-85 and the Pentax 70-200 which I am very happy with. I prefer Pentax brand lenses due their performance, style and build.
I also bought a Sigma 150-500 DG OS that I still use and It was what I purchased prior to when the Pentax 150-450 was available. It's been a fine lens, but I also prefer Pentax lenses for the same reasons you do.
The Sigma lens was a lot less expensive than the Pentax 150-450. But in retrospect, I'm glad I didn't buy other Sigma lenses given Sigma's decision. Concerned about future support, etc...which may not be a factor...I dunno.
Anyways, I suppose, nowadays you never do know what you may buy, becomes obsolete, dropped, different lens mount ...in the photography, but that's the way the Mercedes...Benz...