Interesting. That's almost exactly what Schneider-Kreuznach specified as coverage for the last batch of Kern 14" Dagors, the multicoated ones.
Originally Posted by Dan Fromm
An old copy of "Photographic Optics (Cox)" gives the coverage as 70 degrees.
I had at one time an S-K 300mm Doppel Anastigmat, which is a Dagor clone. It's every bit a Dagor, and comparing mine with a CPG Berlin 30cm Dagor of the same vintage, the Schneider was a bit sharper from f:6.8 to f:11 - after that I could see no difference.