I haven't been successful in my quest for a used diffuser enlarger for 4x5 negs, so I'd like some opinions using what I have. I had a second Kodak 2D to which I've concocted a florescent light source, glass carrier & filter drawer. all that remains is mounting what I have as a lens....a 13.5cm Tessar in shutter. Should it be mounted reversed or normally? Suggested aperatures for best resolution/light output? Primary observations indicate low light output.....any ideas on when long exposures are TOO long, using Ilford MG fiber? Using a level to align carrier, lensboard & easel....better technique?