The late pre-N Grandagon's have "multi coated" stamped on the lens barrel. At s ome point Rodenstock added the -N on the Grandagon. What improvements did the G randagon-N 75mm 4.5 have over a Grandagon 75mm 4.5 multicoated (non -N)? The le ns formulas in photos appears to be identical. Any technical explanations out t here? Thanks.
Best regards,
J. P. Mose
