Hi Guys,

I could do with some opinions please.
I am about to buy my Pentax K-r DSLR and am going to by a zoom lens separately.
Does anyone have an opinion as to which one is better the Sigma 70-300mm F4-5.6 DG Macro ($199) or the Tamron AF 70-300mm F4-5.6 Di LD Macro ($229).

Looking forward to your replies.