[LargeFormat] Re: lens corner definition
philip Lambert
largeformat@f32.net
Fri Dec 8 03:08:47 2000
I think someone recently talked of using a 90mm Angulon on 5x4 and stopping
down to f32 for maximum sharpness in the corners. There is an excellent
lens test table published on the Net by Christopher M. Perez/Kerry L.
Thalmann- showing definition in centre, middle and corner of field for
dozens of lenses. The conclusion might be drawn that stopping a lens down
to minimum aperture does not optimise definition. I expect diffraction is
the problem F22 or F16 is fine.
Philip Lambert