shutterfinger
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From the "Vade" Bausch and Lomb
Universal Portrait f4.0 These seem to be a Petzval type made in:
No(1) 6.5, with front glass 2.75in dia. for 5x4in.
No(2) 8.5, with front glass 3.5in dia. for 5x8in.
No(3) 11.5, with front glass 4.16in dia. for 6.5x8.5in.
No(4) 13.5in with front glass 4.5in dia., for 8x10in.
The separation of the rear glasses was adjustable to control softness, and this may be most useful in close-up
as it increases the depth and eveness of definition.
I missed the 5 on the Voigtländer
Universal Portrait f4.0 These seem to be a Petzval type made in:
No(1) 6.5, with front glass 2.75in dia. for 5x4in.
No(2) 8.5, with front glass 3.5in dia. for 5x8in.
No(3) 11.5, with front glass 4.16in dia. for 6.5x8.5in.
No(4) 13.5in with front glass 4.5in dia., for 8x10in.
The separation of the rear glasses was adjustable to control softness, and this may be most useful in close-up
as it increases the depth and eveness of definition.
I missed the 5 on the Voigtländer