Originally Posted by
Dave Throgmartin
One lens I've seen that sparks debate on the forums is the TDP ISO crops of the Tamron 70-300. My father in law owns both the Canon 70-300 IS and the Tamron. His A1 goto tele lens is the Tamron. When you compare the IQ results on various review sites these two lenses are basically the same.
The ISO crops for the Tamron 70-300 are abysmal on the long end. It appears something was wrong with Bryan's copy when you compare versus images people capture and some of the other review sites.
Some people cry bias, but I think they don't understand that not all copies are the same. In cases like this where something appears wrong testing a 2nd copy could be worth considering.
Dave