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Marcus.Atokina 11-16 is a better option
build quality is much better
larger aperture- 2.8 instead of a 4.5-5.6 . And its a constant aperture which is nice
read this
kenrockwell.com/canon/lenses/10-18mm.htm
also the tokina 11-16 is discontinued and is now replaced by tokina 11-20 which is the same specs just longer focal length. so just get a cheap/used tokina 11-16 for the same price as the crappy canon 10-18