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 don't use T grain films usually but use mostly Fuji Neopan and Acros developed in Xtol, Rodinal or HC 110. On the B&H website, there are 2 available, the Schneider 40/2.8 APO-Componon HM http://www.bhphotovideo.com/c/product/88339-REG/Schneider_12_019746_40_2_8_APO_Componon_HM_Enlarging.html and the Rodenstock 50/2.8 APO-Rodagon N http://www.bhphotovideo.com/c/product/44385-USA/Rodenstock_452340_50mm_f_2_8_APO_Rodagon_N.html I do use APO lenses for my 6x6/6x7 and 6x9 negatives but I don't have anything to compare it to as I have no other lenses. 1) is the 40mm Schneider lens a focal length that would be appropriate for 35mm negatives? 2) would tonality be improved using an APO lens?