Just a quick follow-up.
As I said i designed and printed a thread extension for 48 mm spacing and mounted it on a Copal #3S.
And at last got to take a few 8x10 test shots.
And I'm surprised how well they look. Sharp in the center and more than useably sharp in the corners at f32.
Focus plane seems fairly flat.
So the odd value of 45.8 that I found seems to be wrong. I was just unlucky to find that first.
So a 210mm/6.8 Angulon works well in a Copal #3S with a thread extension for the rear cell to bring it to a 48 mm spacing front to back.
Bookmarks