I Gotta second the Sigma 10-20mm EX DC HSM f/4-5.6 -- I shoot with it regularly on a Sigma DSLR and it's one of my favorite cuts of glass for that system. You don't NEED a wide angle lens to make good, unique landscape photographs, but wide is the traditional focal range. The Sigma gets into the ultra-wide range, it delivers acceptable image quality (You will have trade-offs on lenses at these focal lengths, especially for APS-C lenses). Its build quality is also decent for today's market (not as great compared to the old, all metal lenses), and the controls are standard. My copy handles flare surprisingly well.
Be aware of Sigma's quality control. Buy new from an authorized dealer, or actually mount and test a used lens before purchasing. Sigma is known for their spotty quality control -- if you get a good copy of their lens, it'll easily out-resolve your sensor while delivering wonderful color and contrast profiles. If you get a bad copy, it could be as worthless as a paperweight. This, in my humble opinion, is by far the greatest problem with Sigma lenses, and it is not acceptable. Sigma offers awesome warranties on their EX lenses to compensate (7 years USA!) and will often do (free) repairs even outside of warranty if the lens is known to have a blatant manufacturing defect. Buy new from an authorized USA dealer.
Pentax 16-45mm. It is under that price range and should work with your canon. I would suggest checking bhphoto.com for pricing as they are always the cheapest. If you can splurge for the canon 17-40mm, I would go that route.
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I Gotta second the Sigma 10-20mm EX DC HSM f/4-5.6 -- I shoot with it regularly on a Sigma DSLR and it's one of my favorite cuts of glass for that system. You don't NEED a wide angle lens to make good, unique landscape photographs, but wide is the traditional focal range. The Sigma gets into the ultra-wide range, it delivers acceptable image quality (You will have trade-offs on lenses at these focal lengths, especially for APS-C lenses). Its build quality is also decent for today's market (not as great compared to the old, all metal lenses), and the controls are standard. My copy handles flare surprisingly well.
Be aware of Sigma's quality control. Buy new from an authorized dealer, or actually mount and test a used lens before purchasing. Sigma is known for their spotty quality control -- if you get a good copy of their lens, it'll easily out-resolve your sensor while delivering wonderful color and contrast profiles. If you get a bad copy, it could be as worthless as a paperweight. This, in my humble opinion, is by far the greatest problem with Sigma lenses, and it is not acceptable. Sigma offers awesome warranties on their EX lenses to compensate (7 years USA!) and will often do (free) repairs even outside of warranty if the lens is known to have a blatant manufacturing defect. Buy new from an authorized USA dealer.
Pentax 16-45mm. It is under that price range and should work with your canon. I would suggest checking bhphoto.com for pricing as they are always the cheapest. If you can splurge for the canon 17-40mm, I would go that route.
Sigma 10-20mm f4-5.6