Quote: northcoastgreg: This depends on your shooting style. I choose the DA 12-24, in part, because I knew I would use the 20-24 range far more than the 10-12.
I love the 24mm range, but, unfortunately, the Da/Tokina 12-24 starts falling off dramatically at its long end. My Tamron 17-50 does a much better job in the 17-24mm range than does the Da/Tokina 12-24. I use my 10-20 Sigma for the 10-17 range, where it is awesomel.
Quote: Pentaxor:unless when you compare it with the image taken by the DA12-24. as much as I want to believe this, which I had before I made some more comparisons, there is still some visible corner sharpness, most especially at 10mm. at 12mm, the results that I had seen are much better, although softness can still be detected. if small full image is taken, such softness may or can be very difficult to notice. full crops or anything larger would show the softness much more obviously.
Pentaxor, have you ever shot a 10-20 Sigma??? I ask because, I shoot it often--one of my best lenses. I do not have corner softness, not even @ 10mm so long as I'm @ f8 or smaller & use the Hyper focal distance.
Quote: Pentaxor: the good thing about the sigma 10-20 however is that it is significantly cheaper (unless if you find a steal price for a used 12-24) and pretty good CA/PF control.
Pentaxor, the Tokina 12-24 is less money than the Sigma 10-20--all models, but I wish you were right, because it would have saved me some money. Remember. the 12-24, in any mount, except Pentax where it takes on a new name (Da), is under $400. Just because it has a Pentax name, and a HUGE sticker price increase, does not mean it becomes a more expensive lens; rather, it means Pentax has seriously jacked up the price of an inexpensive Ultra Wdie Angle. Click on this link, to see the price of the Tokina 12-24mm f 4 at B & H Photo:
Tokina 12-24mm f/4 AT-X 124 AF Pro DX Lens ATX124AFPRON B&H
Even though the Sigma is a bit more money, it truly is worth it IMO.