Originally posted by beaumont Put another way, if you're using a 40LTD on the 10D and a 77LTD on the full frame, wouldn't both pictures be the same resolution (albiet with a focal difference of less than 77-44), therefore the potential of just as good a quality picture?
thx
This part: No, not really. For a certain output size; ie a print of a certain size, you have to magnify the APS image 50% more than the FF image, magnifying the lens flaws by equal amount.
This means that an APS lens really need to be sharper to be "equal".