Originally Posted by BetterSense
Is this a problem for you? With my 6x6 Omega condenser enlarger I generally print 5x7s from 35mm at f/16 for about 10-20 seconds, through a grade 2 under-lens filter.
My lenses are visibly better at f4-5.6, so I generally don't stop down further than f8. But you have a point - on a 5x7 print, the difference probably isn't very big.