
Originally Posted by
neuroanatomist
Hmmm...the Tamron is definitely sharper at the wide end (even with both lenses wide open where the Tammy is a stop faster). At the long end, they aren't really different at f/4, and the Tamron @ 200mm f/2.8 is definitely softer than the Canon at 200mm f/4. Also, note that Bryan tested two copies of the Tamron 70-200 f/2.8, and copy 1 (which your link uses, Jan) is sharper than copy 2 across the range - except at 135mm, where both copies of the Tamron fall apart at f/2.8. (Of course, there are copy-specific variations in Canon lenses as well.)