I've got my eye on a Beseler 67 Dichro head enlarger. The fellow is selling it with a 50mm lens and 35mm negative plate... I need it because I've taken the insane jump (i.e. buying more gear) into medium format and want to do my own printing. I'm not sure what sort of lens I'd need to print 645 negatives...and where I could get a holder? Can you buy these cheaply someplace? Thanks!