10 out of 10 points and recommendedSharp at 300mm wide open, focus accuracy, very cheap!!None so far
I have had quite some lenses. With my canon 550d and 5d mark III i had the 50mm prime, the 70-300 IS, the 70-300 IS L, the 70-200 4.0 L and the 70-200 2.8 II (twice). Now i switched to Nikon and i have the 35mm prime and the 18-105 kit lens.reviewed June 22nd, 2013 (purchased for $460)
I can tell you this, the tamron 70-300 is sharp! It is sharp at 300 mm, it is sharp wide open (@300mm) and focus accuracy is almost 100%. I feel it is on the same level or better than the canon 70-300 L with respect to sharpness. Both canons where less sharp at 300mm wide open. The tamron is better. Where this lens stands out is focus accuracy. It may be due to my nikon d7100 body but focus is spot on any time. Only my first version of the canon 70-200 2.8 II L had better Sharpness and color.
Strange thing is this lens is € 350 euro including a free polarise filter. It is a bargain.
I am very critical on focus performance and sharpness and switched most of my purchases for better copies within couple of days afterpurchase. This one stays for sure. My 35mm prime does not give the same focus accuracy.
Overall i am impressed. I think tamron improved the production quility of this lens lately.
I purchased my copy in holland.