Originally Posted by
Ole Tjugen
Not much, unless you're shooting wet plate or some other blue-only sensitive emulsion...
Is it evenly soft all over, or is some part worse than others?
Is the ground glass in exactly the same place as the film? These extreme WA's also have very shallow depth-of-focus.
I don't know that particular lens, but I use a 150mm Busch WA Aplanat on all sizes up to 24x30cm (9.5x12"), and only the last inch in the corners of that size is noticably softer than the rest - and the center is extremely sharp!
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