I have a local guy selling a tamron 70-200 f2.8 for $450. I can also pick up a canon 70-200 f4 non IS for the same price. What would you go with. I read the tamron is a bit slow to focus. And even the seller of the tamron stated its slow to focus at anything closer then 5 feet. I have 70-210 f3.5-4.5 that one of these lenses will be replacing


