bulldog-yota wrote in post #11611330
Mostly looking at wide angle lenses for landscapes with a 7D. (No a 5DII is not in my budget :lol
I have the Sigma 10-20 f4-5.6, and the results are OK, but really come up short comapred to the 24-105 pictures under the same circumstances. The 24-105 picture just seem to be much sharper, especially when blown up for larger prints.
So just wondering if there was a reasonably affordable lens for a 7D that will produce much better results than the Sigma. Something that will later work on FF body will be a bonus.
Or maybe my Sigma is just not that sharp, or my technique is not that good with it??
There is exactly one UWA lens that will work fully on full frame, if that's important... Sigma 12-24 is a full frame lens that will also be quite wide on crop. It's rather pricey and probably compromises more in IQ than the lens you have right now. But it's the widest available non-fisheye, FF lens.
The next widest FF lenses are Nikon 14-24/2.8, Canon 14/2.8, 16-35/2.8, 17-40/4. Most of these are rather pricey. The Nikon will need an adapter, won't AF, of course, and aperture control will be fully manual, too. The three Canon EF lenses will have full functionality. 14mm is very wide on a cropper, but not ultra wide. 16 and 17mm are wide on a cropper, but not what I'd call very wide.
Some other lenses might have limited use on FF. They will have to be third party, though, since Canon EF-S lenses can't even be mounted on their FF bodies (well, at least they can't without some work on them with a Dremel tool, which you might be a little reluctant to do).
I use the Tokina 12-24/4 personally. It's a crop camera lens, but I have experimented with it on FF and can tell you it will work to about 18 or 19mm before vignetting starts to set in. It's a very well made lens ("L-like"), and for about $500 new I think it's one of the very best values among the UWA, non-fisheye lenses.
The Tokina 11-16 is nearly identical in build, size and weight, but is about 20% more expensive, has that ultra narrow zoom range, and I don't find f2.8 all that important or useful on an ultrawide angle. I don't know if or how well it works on FF.
I haven't tried the Tamron 10-24mm, so can't really comment.
When I was shopping for an UWA, I compared the Canon EF-S 10-22 and Sigma 10-20 with the Tokina and a now discontinued 11-18 Tamron.
The Canon 10-22 can't be mounted on FF, of course. But I felt the IQ was pretty equal with the Toki 12-24, and that these two lenses were the best of the bunch. except of course the Canon is 2mm wider (take two steps backward!). The Canon was the most expensive of the UWA cropper zoom bunch, too (the FF Sigma 12-24 is more expensive, as are the Nikkor and EF lenses mentioned above). The third party lenses all seem to have higher build quality than the Canon, although the Canon is quite well made, Canon's "mid-quality/USM" that's a notch or so below the L-series lenses.
The Siggy 10-20 seemed to have slightly lower IQ, in my comparisons. I don't know if it can be used on FF at all... probably in a limited way, like the Toki 12-24.
The older Tamron 11-18 image quality just didn't impress me as much as the other lenses. IQ wasn't as good and it also seemed to have lesser build quality than the other lenses. A short time later they replaced it with the currently available 10-24, which I really haven't compared.
All these lenses except for the Tokinas, the Nikkor and the EF Canon are variable aperture lenses. By that I mean the aperture changes size as you zoom. It varies, but might be f3.5 to f5.6 or something like that. The two Tokinas, the Nikkor and the Canon 16-35 are all fixed aperture zooms. Their apertures don't change size when you zoom, which generally are more expensive.
If you throw out the idea of using the lens on FF at all, there are a number of moderate wide Canon EF-S zoom lenses, that go to 15mm through 18mm. I just don't have experience with most of these, so can't really comment.
There are some even wider lenses now, like the 8-16 Siggy. Interesting, I haven't tried one, but I can't imagine it would work at all on FF.
I'm happy with my Tokina 12-24. It's the only "crop" lens I own, yet is still usable on FF in a pinch (I'd usually just use my Canon 20/2.8 though.)