So scherbi and I were discussing crop vs. full frame resolution differences today in regards to super telephoto photography (birds, etc). I decided to make a chart that depicts the resolution in the APS-C sensor area for each of several Canon cameras. I was quite surprised to find that the 40D beats everything else in this area. It appears to top all other Canon DSLR models in terms of raw pixels/mm (175). Even my old 10D beats out my new 5D by 1.2M pixels! So if I had the choice of using a cropped body or full frame (cropping during post processing instead) for super telephoto shots, it would seem as though the cropped body would yield higher resolution. FYI - These calculations were done by taking the native resolution of each camera's sensor and cropping it to the 40D sensor size. Sorry I did not have room to show the native 1D resolution in this diagram.