500d / T1i sigma 17-70 vs canon lenses

Started Apr 21, 2010 | Discussions thread
OP Knnyiam New Member • Posts: 8
Re: 500d / T1i sigma 17-70 vs canon lenses

I am only experiencing the slow autofocus in low light setting. Day light af works just fine but in low light it is noticeably slower than the canon 18-55 and maybe the canon 1.8, it is however more silent. So my question is, should that be the case for a $450 lens compated to $80 lenses?

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