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Another thing to consider (from dpreview):
One design decision may however cause a degree of dismay; the lens uses a relatively unsophisticated micro motor system for autofocus, as opposed to the ring-type USM design more commonly seen on mid-range lenses such as the EF-S 17-85mm F4-5.6 IS USM. Consequently, potential buyers may struggle to find any obvious advantage over Tamron's recently announced 18-270mm F3.5-6.3Di II VC LD Aspherical (IF) Macro, which sports a longer zoom range and Tamron's own optical stabilization system. Aside from this, Canon have produced a lens which is clearly designed to counter the undeniable buyer appeal of Nikon's popular 18-200mm VR head-on; so how does it match up to the challenge?
The big problem with a lens like this is not being able to shoot at f/2.8
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Paul
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