Quote Originally Posted by Dave Throgmartin View Post
If I apply this logic and look at the equivalent of 24-105 f/4 crop equivalence when shot on full frame I get a 15-66 f/2.5. That not very fast on a crop lens is now surpassing the very highly regarded 17-55 f/2.8 in both speed and versatility while also getting better image quality! Also, a great prime like the 35mm f/1.4 L is now an equivalent 56mm f/2.2 lens. Still nice, but not nearly as nice as the real thing and probably equivalent to the much cheaper 50mm 1/4 now.
Most of what you said is correct. Daniel's comparisons were for a crop camera with a 100mm lens. I am not sure of your logic in your statement, are you saying that the 35mm F/1.4 on a crop frame vs a 56mm on a full frame?

The 35mm F/1.4 shot at F/1.4 on both cameras is going to have low IQ no matter if it is shot on a FF or a Crop Camera. It may have a deeper DOF and narrower FOV but the quality will still be lacking, until you tighten the aperture a bit.