I shoot 6X6 and 6X9 negatives. Actually, the 6X6 look a tad small to me compared to the 6X9 ones. I use a Kodak Enlarging Ektar 100mm f4.5 for the 6X9.(posted 8233 days ago)I know that the lens is the most important consideration for printing negatives (though I would argue that my cold light head is really wonderful!)
Since I print B&W exclusively, I wonder if I should upgrade the Ektar to a Rodenstock, Schneider, or Nikon. Each of these is f5.6 which will be more difficult to focus than the Kodak f 4.5.
Bruce Karnopp