Originally posted by mee
Do you really have an f/3.5-4.5?? I have the f/4 - 5.6 and only thought there was my lens and the 3.5 only ?
Yeah, I think that was a common typo, the older Sigma 10-20 is indeed f/4-5.6. Most people who buy such a lens spend all their time at f/8-11 anyways, so the max aperture doesn't matter that much.
If I was any less into astrophotography, I'd get the f/4-5.6 and be totally happy. (I've reviewed both versions, and found the new f/3.5 constant version to NOT be worth the 82mm filter threads it requires, if anything its extreme corners are even LESS sharp when stopped down than the older version!)
Unfortunately, one of the main reasons I'm switching to Pentax in the first place is for their WR lenses, so I hope there is a 10-16mm f/2.8 WR, or a 11-20mm f/2.8 WR, or some other version of such a lens, in the near future. I see one on the Pentax Roadmap at present, however from the ambiguity of the chart it appears to not be as "ultra" as I like my wides. Then again, if they went the route of the Sigma 18-35 f/1.8 Art, and delivered an f/1.8 or f/2 zoom that started at 12, 13, or 14mm, I sure wouldn't complain!!!
=Matt=