The Rodenstock 80mm apochromatically corrected lenses of the APO-Rodagon-N series set new standards for the most stringent demands of professional enlarging techniques.
The advantages are clearly visible in both color and black and white enlargements. The APO-Rodagon-N is therefore the amateur's and professional's choice whenever the very highest reproduction quality is required.
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I'm using this lens on my Nikon Z7 via adapters. It is very sharp all the way to the extreme corners. No trace of CA what-so-ever. It does exhibit quite a bit of flare when the light source is anywhere near the frame. Two inches of lens hood helps considerably but it can still be an issue under the right circumstances. I'm very happy with this lens.
The 80mm APO-Rodagon N is one of the most perfect lens formulas I have ever used. The other is the Zeiss 100mm Makro-Planar. I not only enlarge with this lens (less now since I moved to carbon transfer printing, which is a contact printing process), but I mount it on a Nikkor PB-6 Bellows with an adapter and record images with a Sony a7RII on the other end of the apparatus. The results are astounding for sharpness, flatness of field and freedom from aberrations. The PB-6 Bellows with the attendant adapter to mount the a7RII will not focus to infinity with this lens but that is not the magnification ratio at which it is optimized in any case.