I agree... forget the 17-40mm. It will not be any improvement over your kit lens, other than build quality and USM focus drive. It is an ultrawide designed for full frame, would just be a "standard" zoom on a crop camera, and has a fairly narrow range of focal lengths too.
ekfaysal wrote in post #16155195
thanks alot guys.
you guys rock
so i'm on canon 10-22mm or a Tokina 11-16 f2.8
One lens is 2.8 and the other is from Canon
Both lenses are quite sharp.
The Canon 10-22mm has a variable aperture (f3.5-5.6). It's reasonably well made (Canon mid-grade quality) with fast, accurate, quiet USM. It's extremely resistant to flare, which can be a problem with ultrawides simply because they encompass such a wide view. The lens hood (sold separately) is large, but recommended. It works. (Note: all the third party lenses include a matched lens hood.)
The Tokina 11-16/2.8 gives f2.8 for those who really, really need it (most really don't, they just think they do). The trade-off to get f2.8 is that the range of focal lengths offered is the narrowest of any UWA zoom. Also, it's more susceptible to flare and one of the pricier models.
There are also...
Tokina 12-24/4 which has good image quality, is considerably less susceptible to flare than the 11-16 but not quite as good as the 10-22, and costs less than either of them. Non-variable f4 aperture and still very wide, though it's not quite as wide as the other lenses.
Sigma 8-16mm is the widest of the wide. Fairly expensive and has rather strong, inherent wide angle distortion effects.
Sigma 10-20mm... there are actually two of them. One has a variable aperture and the more expensive (and larger/heavier) has a non-variable f3.5 aperture. The old 10-20mm Siggy with the variable aperture wasn't as sharp as the Canon or the Tokinas. It also wasn't as flare resistant as the Canon or the Toki 12-24mm. However, it has been replaced with a newer version now and might be better in these respects.
Sigma 12-24mm is actually a full frame capable lens and is quite pricey with heavy wide angle distortions. Aside from fisheyes, it's the widest lens available for full frame, but sort of a waste of money to use it on a crop sensor camera such as the 60D.
Tamron 10-24mm has the widest range of focal lengths in a single lens. It's one of the more affordable ultrawides, but is a little soft at the 24mm end (improves when stopped down).
Have fun shopping!