It is important to realize that any 50% dithering problem will occur in
the 50% area of the *negative*, not the 50% area of the print. First, I
have an image in Photoshop which I am happy with. To this I apply the
correction curve to make an appropriate negative. This correction curve
results in a washed out image on my screen. It is in this washed out
image that you have to go hunting for the 50% areas (use the info
palette). If you have dithering problems, they will manifest themselves
in these areas of your print, EVEN THOUGH these areas (in my case anyway)
are actually 3/4 tones on the final print. Are these the ares in which
you have been looking?
David
p.s. my 50% in does not = 50% out, though yours may.