Im trying to set up my black and white darkroom and I want to get the right equipment. I will be printing 35mm, 6x6 and 6x9. I have a 50mm Beseler Color Pro, a 50mm Componon, a 80mm Componon, and a 105 Componon. The last two do not have lensboards because they do not fit in the 39mm beseler lens board I have and they are less than perfect glass. I would like to replace them but not sure what is best for big b+w enlargements.