Quote Originally Posted by Geoff
...I'm a bit perplexed by exactly what you're looking at to draw a conclusion that xx canon lens is sharper than yy nikon lens...Perhaps someone could write a quick paragraph as how to properly use the resolution charts to augment what Bryan has already written...

I think the point is that you cannot draw such comparisons using these charts. If you look through the Canon lenses, you'll find some shot with both FF and 1.6x crop bodies, and the apparent fields of view are quite different. If you read elsewhere in the About ISO 12233 Charts page:


Quote Originally Posted by Bryan Carnathan
Lenses should be critically compared to each other only with test samples from the same camera body as it is the combination that is tested. Camera can be critically compared to each other using the same lens(theCanon EF 200mm f/2 L IS USM LensandCanon EF 200mm f/2.8 L II USM Lenshave results from many cameras included)...

Most of the Canon lenses are shot with a 1DsIII body, so they can be compared to one another. Bryan indicated two lenses which have been tested with many (Canon) bodies, so you can compare the bodies. I think all of the Nikon lenses are tested with a D3x - meaning that you can fairly compare those Nikon lenses only with one another, and not with Canon lenses.


At least, that's how I interpret it.