Hi Sirs...
This has been bugging me for quite some time...
Does the Sigma 17-50 f/2.8 OS really outperforms the Tamron 17-50 f/2.8 VC?
I have the latter, it's been good to me but not all the time...
Just would like to know / affirm that switching to sigma (considering the price tag) is really worth it...
thanks!






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