shutterbug guy wrote:
Short answer and I\'m sure to be badgered over this response.
It\'s all about the light, some bodies perform better than others with limited aperture. At f6.3 we\'re seeing this, plain and simple.
Roger
Isn\'t the 1DmkIV rated to f8 for AF though?
Also do if thus is the case, it is a poor showing for Tamron not to list compatible cameras. I find it hard to believe that they conducted all their field testing on certain bodies and ignored the 7D...
