Well, no laser alignment in my darkroom, just eyes, glass carrier, a 9x12 Durst B&W test neg and lots of patience. Never went larger than 36x50 inches, though. Absolutely mask out the negative and remove all flare light. Apo=expensive, except maybe 50mm or if you're really lucky. Recently a practically new G-Componon 105/5,6 came into my hands for 100 Euros. I guess G=affordable, Rodenstock or Schneider.