I just got an "un-famous" lens - a late 270mm f:6.8 Meyer Görlitz Doppel Anastigmat.
Guess what: It's a Dagor. So the image circle should be around 45cm at small apertures, and that looks reasonable from just looking at it. Certainly plenty for my 24x30cm camera, almost enough for the 30x40cm. Not bad for 24 Euros?