Quote Originally Posted by BrianShaw View Post
Alan.... are you sure that you have an Ilex/Acme #3, and not a #4 shutter? Grimes states that they reshutter your lens into a Copal 1 or Ilex 4. Is that erroneous? Other sources (Goerz) seem to agree that it is indeed a #3. Makes one wonder, though.

What is your "source of truth" on that and the flange dimensions? Something's not adding up...
In post #7 here: https://www.largeformatphotography.i...r-and-adapters we can clearly see that it is a No. 3 Ilex Acme.

I heartily second Rick's recommendation that every large format photographer get 6" caliper and both a set of metric and inch thread gages. Cheap digital read-out calipers will switch between inch and metric and should be "good enough".

David "feels compelled to buy Starrett but you needn't" Lindquist