I've been wondering about this.... I have an Omega D-2 and D-II with standard lamp housing and condensers. One has the variable kind and the other is the fixed kind. I understand the TRUE condenser enlargers have a naked (non-frosted) point source lamp and condenser under it. The True defused kind has a side mounted lamp and mixer box, and reflected light hits the negatives. Then, what do I have? The lamps are frosted and top mounted. I am assuming just about everyone knows these legendary enlargers well so that I don't need to describe it in detail. I ask this because Kodak's literature on film/developers state its timings are based on "defuser enlarger" that when one is using condenser kind, should reduce timing by 20%. I am not asking this to debate personal preference and timing and such. I'm curious as to how to classify my enlarger.