I have amassed a small collection of these and intend to use some, or all of them on my 4x5 Graphic.
I do not know precisely how far down one ought to stop down for best definition, but at some point definition is compromised by diffraction anyway.
Lge format lenses seem to reach their best definition about four stops down from whatever is wide-open. I may be completely wrong but what are your findings?
The only one I have mounted at the moment is a no-name 4". I have shot at f16, which is wide open of course and at f32. I was a going to have the negs scanned and printed.
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