I think I agree with Claire here.

Everything that I do with an enlarger, is to prevent soft edges on enlargments
Glass Carriers, longer than normal lens for film size,Apo Lenses *flat field*
To think one can work an enlarger like a camera kind of makes me think I have been doing something wrong all these years.

If I am not in alingment ie baseboard, negative stage and lens stage, I do get out of focus prints in one section of the image.
When I align the three stages and use a glass carrier , I do get sharp images edge to edge.

I find a very subtle difference in *grain structure *by closing down two stops from wide open. Knowing that my enlarging lenses are not the same as camera lenses , makes me wonder where all this dof is at the base board level.

Am I missing something in my enlarging proceedure????