![]() It's also got the better USM focus drive (some of the Sigma have similar HSM), which with many other types of lenses (standards, teles, macro) is a pretty desirable feature for speed and accuracy. ![]() In fact, it's unusually good resisting flare. Speaking of the Canon 10-22, it is easily one of the best of all the UWA when it comes to flare and image quality. I don't know about the other lenses, maybe someone else has tested them. And I've seen Canon 10-22 modified to be used on FF too, but they seemed to have pretty strong vignetting. I understand the Toki 11-16mm is usable too, but only at 16mm. The EF 20/2.8 that I usually use as my widest FF lens certainly is better corrected for wide angle distortions. There is more distortion than some other lenses. On FF can be zoomed as wide as 18 or 19mm before it starts to vignette significantly and, at least at this setting, the rear elements don't interfere with the camera's mirror. I have a 12-24 personally and have tested it on my 5D Mark II, though I mostly use the zoom on crop cameras. the Toki 12-14 actually can be used on a full frame camera. But you might also want to consider the Tokina 12-24/4, which is about $100 cheaper than the 11-16 and similar build, image quality and much more resistant to flare issues. And it's cheaper than the Canon (which doesn't feel as well built). The Toki 11-16 is sharp and a well made lens. Most of the time we do just the opposite and actually end up stopping UWA lenses down for more depth of field. ![]() It's hard to get very much background blur with an ultrawide. You won't find it very useful for shallow depth of field purposes. In truth, it's actually pretty rare for most people to need f2.8 on an ultrawide. The 11-16 is the only f2.8 lens among the ultrawide offerings, but the trade-off to get the bigger aperture is a very narrow range of focal lengths, higher price than some other lenses and more susceptibility to flare (which is more likely to be an issue with an ultrawide than other lenses). The Tokina 11-16/2.8 you're considering is a decent lens, but is just one of a bunch of possible UWA choices. So I'd suggest you just get the ultraside lens you need for the camera you have now and start enjoying it. ![]() Trying to get an UWA now that will serve on both crop and - maybe, some day, perhaps - a full frame camera will cost you a lot more, plus it will be bigger, heavier and either won't go nearly as wide or will compromise a bit on image qualities. If and when that ever happens, you can sell the crop lens and replace it with a FF compatible ultrawide. Forget about compromising on a purchase now because someday, maybe, you might get a full frame camera. ![]()
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