Originally posted by Edgar_in_Indy I expect that there will be a new version eventually, most likely with HSM and OS.
Yes, that was the speculation back then, too. There is no question that Sigma
should bring out a new version of this lens, as it's just too good and reasonably priced to let fade away, but they don't usually take this long to intro an updated model. Also, I'm not sure how compelled I would be to replace mine. It already focuses really quickly, so HSM would only mean silently. Granted, a boon to birders but it's not what you would call loud now. Plus, HSM precludes the use of their TCs on Pentax, at least for AF. And then, of course, we Pentaxians don't have tremendous need for OS. I'm sure in-lens would be better for this type of lens, but how much better? Then there is the fact that many of the lens "updates" that Sigma brings out are not as optically good as their predecessors. Some are, some aren't.
I called Sigma a couple of times back when the discontinuation of this lens took place. I ended up talking to several people, all of whom told me that there were "no plans" to introduce a new version of this lens. You can take that for whatever it's worth, which ain't much. Really stupid on Sigma's part, IMO. They seem to be willing to put all of this market's eggs in the 120-300's basket, and has been said, there still hasn't been a Pentax version of that one, either, and is HSM, so no use of their TCs. Just bone-headed product planning if you ask me, which, surprisingly, they didn't.