i have done pretty much research...i think 17-55mm out win tammy is the USM ... as for focusing accracy both the same??
so does it mean canon focus faster than the tammy? tammy with vc cost 900++ and canon 1.5++ about 600 difference...
Focusing accuracy depends if your tammy have front or back focusing issue. Mine seems to be fine (jus a tad off) and its acceptable for me.
As for focusing speed, I find mine to be reasonable but I've had no experienced with the canon lens so I can't tell. Most importantly, I'm not spoilt by super fast focusing lens before (eg 70-200 vr 2.8 etc) so its turning out to be a very positive experience for me.
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