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Wide angle lens for Rebel XTi?

I've been looking around for a decent wide angle lens for my new camera before I buy it. I came across the sigma 17-70mm f/2.8-4.5 and imo, it looks fairly decent. Some posts elsewhere have given me doubts. I have read about a problem with back-focusing. What is this, and how do I find if I'm getting the problem. I've already decided on the canon 70-200mm f/4L as my telephoto lens. Any suggestions for a decent, reasonably priced wide-angle lens?

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If 17mm is wide enough for you on a XTI, check out the EF-S 17-85mm f/4-5.6 IS USM. If you don't like an EF-S lens, look at the EF 17-40mm F4L.

If you want to go wider, you have to look at the following lenses. They all work only on crop bodies and will not work on full-frame:

EF-S 10-22mm f/3.5-4.5 USM
Sigma 10 - 20 mm f/4 - 5.6
Tamron 11 - 18 mm f/4.5 - 5.6
Tokina 12 - 24 mm f/4,

The Canon gets very good reviews, but is quite expensive.


Regards,
Thorsten
tr-photo-blog.blogspot.com

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Canon EF-S 10-22mm f/3.5-4.5 USM it is hard to beat this lens,a bit expensive but very good

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i love my 10-22. a bit pricey, yes, but an excellent lens.

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How is the barrel distortion on the EF-S 10-22?

I tried out the Sigma 10-20, and the distortion was quite significant all the way up to about maybe 18mm.

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a really thorough review can be found here - www.luminous-landscape.com/reviews/lenses/Canon-10-22mm-test.shtml

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www.nickamoroso.com

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I've had the Tokina AT-X 124 PRO DX 12-24mm F4 for some two months now and am very impressed with the clarity of the pics taken with it on my 400D (xTi). See e.g. my two submissions this week's contest:

http://www.bytephoto.com/photopost/...=503&page=3

http://www.bytephoto.com/photopost/...=503&page=3

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