I hope I can explain myself correctly but this is my problem. I have a 5X4 enlarger and I want to get the maximum size print possible from it but my problem is that my darkroom is in a low roofed room. With the enlarger head at it's maximum hight will I get a larger print from a 135mm lens or should I opt for a 150mm lens. Thanks for looking and thanks in advance for any help that may be out there, Paul.