Quote Originally Posted by ymc226 View Post
Right now I use a Nikon 50mm 2.8 enlarger lens, exclusively print B&W and am wondering if the APO series of lens currently available will make a difference when printing onto FB paper.
I presume you are going to be making some massive enlargements. In that case the edges will be sharper with your big enlargements, compared to the Nikkor. The Nikkor does not have as big of a useable image circle, so when you are making those big 25x enlargements, the edges will be compromised. You can also use those 45 and 40mm HM lenses for enlargements less then 25x but I never do. Because the enlarger head is so low, I can't open the printing easel.