In the middle of contemplating the rapture last night, a thought struck me (why then I have no idea-but that is another thread perhaps).

I am well acquainted with how diffraction limits effect my negatives when shooting (and plan accordingly-I have tested this on many of my lenses and know where it strarts to influence sharpness).

But I have never noticed its effect when enlarging and sometimes I stop way down purposely to get long exposures to give me time to do complicated burning and dodging. Hmmmmm.....