After reading the Cteinīs book and looking at the Rodenstock literature (Paul Butziīs scans -I know that this data charts given by manufactures are theoretical-), I arrived to the conclusion that either the apo and non apo enlarging lenses have moreles the same performance at working aperture and magnification, even better for one of them to its apo counterpart (105mm lenses, MTF chart). Also, in terms of light fall-off and distortion, the non-apo versions surpass their apo equivalents.
Is it correct?
I would like to know about the color aberration differences and corrections in this apo and non-apo versions. I wonder if the benefit of this lenses resides only on this topic, and in what manner this benefit really affect (or theoretically could affect) to the prints. Could this difference be obvious only for color prints? I understand that most of us use color filters for b/w work with VC papers. Also, I have read a lot of times that the apo lenses only could be checked in the corners of very high prints... the MTF charts donīt reflect it in all cases. Iīm very curious about it.
Could anybody give a more detailed explanation about this topic? We would be highly thankful...