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Okay, I am looking to "upgrade" from my lenses I have now. Actually, it's not really an upgrade because lens are completely different..

I have the canon sxi with the lenses kit:

- EF-S 18-55mm f/3.5-5.6 IS Lens (Black)

Then bought the:

- Canon EF 50mm f/1.8 II

Now, I want a wide angle..

I was looking at the

- Tamron AF 17-50mm F/2.8 XR Di-II LD SP ZL Aspherical (IF) Zoom

but my friend told the kit lenses covered the focal lenses.

then I looked at

- Sigma 10-20mm f/4-5.6 EX DC HSM Lens

Is there anymore suggestions for wide angle lenses?

Thanks a bunches.

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Canon Digital Rebel XSi with EF-S 18-55mm f/3.5-5.6 IS Lens and a hood!
Canon Powershot G10

The main advantage of the 17-50 is that it has a larger aperture, not the wider focal length.

The sigma's supposed to be quite good, IF you get a good copy. So make sure to test it yourself in the store

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I take pictures so quickly, my highschool was "Continuous High".

The Tokina 12-24 f/4 is highly rated. There is a new DX II version out which makes the older DX version cheaper.

For a little more the Tokina 11-16/2.8 and the Canon 10-22 are good choices

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Canon 7D/350D, Σ17-50/2.8, 18-55IS, 24-105/4 IS, Σ30/1.4, 50/1.8, 55-250IS, 60/2.8, 70-200/4 IS, 85/1.8, 580ex II, 430EX II, 270EX II.

If you're going ultra-wide angle, then you're correct in that the Tamron 17-50 doesn't really help. At 17mm, it's only 1mm wider than the kit lens at 18mm which is a tiny difference. For really wide angle, you're looking for lenses going down to around 10mm or so.

The original Sigma 10-20 f/4-5.6 is the cheap option but subject to Sigma's less than perfect track record at quality. There's recently a new 10-20 f/3.5 too although I'm not sure if that is much of an improvement.

Canon have their own 10-22mm lens. It is much more expensive, but at the same time it is about the best you can get.

Tamron do an 11-18 and a newer 10-24.

If you want to go even wider than these, you can start looking at fisheye lenses.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.

Thanks so much for the replies. I narrowed it down to three lenses.

- Tamron AF 10-24mm f/3.5-4.5 SP Di II LD Aspherical (IF) Lens
- Tokina AT-X116PRDXC AT-X PRO DX 11-16mm Ultra-wide Angle Lens
- the expensive canon one. ):

I'll decide and how much money I have in the bank to break it.

Responses and I learn so much.. before ths post, I didn't even know the differences between the lenses.

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Canon Digital Rebel XSi with EF-S 18-55mm f/3.5-5.6 IS Lens and a hood!
Canon Powershot G10

Just get the Canon - I've never met anyone who wasn't completely happy with that lens. I shoot a lot with it and it's sharp, has low distortion, a great zoom range and is lightweight

The tamron is very soft as far as I can tell from various reviews, so definitely don't get that one.

The Tokina gets very good reviews and should be a great lens too, but I like the wider zoom range of the Canon 10-22mm and since you usually don't shoot at f/2.8 anyway with a wide angle lens, I merely see the benefit of that large aperture, since it makes the lens much heavier than the rest of the bunch.

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Canon EOS 5D Mark II | Canon EF 35mm f/1.4L USM | Canon EF 85mm f/1.8 USM | Canon EF 135mm f/2L USM
...and a lot of lighting stuff. -> complete list of equipment

Website
Blog

cant go wrong with either of these...

PS: the tamron is just below the canon 17-55 f2.8 in terms of resolving power.
http://www.photozone.de/canon-eos/289-tamron-af-17-50mm-f28-sp-xr-di-ii-ld-aspherical-if-canon-test-report--review?start=1
http://www.photozone.de/canon-eos/178-canon-ef-s-17-55mm-f28-usm-is-test-report--review?start=1

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Canon 50D || Tokina 11-16mm f/2.8 || Tamron 17-50 f2.8 || EF 50mm f/1.4 || EF 35-105mm f/4.5-5 USM || 430EX II w/wireless system flickr

the 17-50 sure is, but the 10-24mm is not and that's the one we're talking about

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Canon EOS 5D Mark II | Canon EF 35mm f/1.4L USM | Canon EF 85mm f/1.8 USM | Canon EF 135mm f/2L USM
...and a lot of lighting stuff. -> complete list of equipment

Website
Blog