The problem is the same with enlarger lens, there's a sweet spot.
Usually, 2 stops less than maximum aperture.

Jorge

ojunk (ATIPPETT) wrote in
:

I recently asked the question about sweet spots for Cameras and
Enlarger on the MF site. I received so very good information on
camera lens and learned about diffraction. My question is "are the
problems the same with enlarger lens?" Since the projection is on to a
two dimensional field does this change the quality of the print.
Is there an optiimum f-stop?
Thanks.