Thanks. I've seen the slower lens for as little as 350.00 (very tempted at that price), whilst the F3.5 is nearer 500.00. I'm using a D90, so I guess its ISO performance would help out with the slower version, in most cases.
Digital photo tested a few super wides this month and rated the sigma f3.5 above the nikon and canon for iq:shrug
That said, it still recommended to f4 - 5.6 as the gold award best buy, due to its cheaper price and the fact that a wide aperture isnt that necesary for most using a wa lens......
Thanks - this is not an easy decision!
At the end of it all, the Sigma 10-20mm f/4-5.6 showed less distortion than any other, easily as sharp as the Nikon, and little-to-none CA.


which makes it harder to correct in PP (if you want to correct it).
Of course you're always going to get a degree of perspective distortion, but I was talking more about barrel & pincushion distortion, which (in my experience) really isn't a problem on the Sigma f/4-5.6 (certainly not when compared with the alternatives).
Personally I never correct it (never felt a need to), but I wonder if that's a non-issue for those with CS5 given its new lens & body databases in the distortion correction bit.
Believe me, I'm not a big fan of Sigma overall, but this one really impressed me. It's the only non-Nikon lens I'd really consider owning (and the only non-Nikon one I do own).
Personally however, having used both lenses (and the Canon 10-22) I think the Tokina is a lot better lens. As the old saying goes, don't knock it til you tried it.My plan is to try out the 10-20mm, somehow, and hopefully the 12-24. For non-landscape shots, the 12-24 AF sounds like it might be smoother/faster/quieter. And one might come up at a price to tempt me. If not, I'll probably go for the Sigma.
Thanks. I've seen the slower lens for as little as 350.00 (very tempted at that price), whilst the F3.5 is nearer 500.00. I'm using a D90, so I guess its ISO performance would help out with the slower version, in most cases.
Didn't realise there were 2 versions of this lens. I'd go for the variable aperture as I'd use it for massive dof so would be stopping down anyway.
Although 24mm at the long end would mean I could leave it on for other stuff....
Where abouts are you?