Quote Originally Posted by Tom Duffy
t I maintain that the only difference is that I'm shooting at a smaller fstop with 8x10 and the loss of resolution is caused by diffraction.
Take care,
Out of curiousity, what are the focal lengths, f-stops used and type of lenses you used for this comparison? As I said earlier, diffraction is a factor related to the physical hole size, not the relative aperture.