Quote Originally Posted by df cardwell View Post
The lens, I'll bet, is the same design as a Dagor, and will cover more than an ample amount.
The cheaper Anastigmat 135mm f6.8 lenses were often triplets although some where Doppel Anastigmat, few would have been up to the quality of a Dagor.

Judging by the OP's image taken with the lens and the fall off at the corners it may well be an Triplet.

All manufacturers offered 9x12 cameras with a variety of lenses and shutters, the best models used Tessars, Heliars, Xenars, Eurynars, Dagors etc in Compur or Ibsor shutters, then with the cheapest lenses a 3 speed Vario or Derval shutter which is what appears to be on this particular camera.