Martin Rickards
Member
The Meogon 80 mm f2.8 is an anomaly. Frequently selling at "collectors'" prices, it is optically inferior to the f5.6 being notably softer, or so they say.There's no question that any of the 'later' lenses from the major brands will be just fine, eg Rodagon, Componon-S, EL Nilkkor (the later 'N' lenses), Fujinon EX (EX 4.5/75), Minolta (C.E. Rokkor-X 5.6/80), Omega/Osawa/Hoya 75, the Meogons (Meogon S 4/80 and Meogon 5.6/80, there is also a Meogon S 2.8/80 but they are quite expensive). I doubt you'd go too far wrong with any of them. There's also a Komuranon-E (and an 'S' version, I think the only difference is improved coatings) 5.6/75 from the 1970s which is a 6 element lens with a 39mm rear thread (so simple to adapt) and usually quite cheap, it's worth considering. But just buy a 4/80 late model Rodagon or Componon-S and you'll never have to think about this again.
The condition of the lens matters so an APO-Rodagon-N that's had haze, fungus, surface cleaning marks (or just been re-assembled badly) could be outperformed by a clean version of an otherwise 'inferior' lens. Unfortunately many enlarging lenses are stored badly so the above issues are very common with second hand lenses.