Hello group,
I have a Portrait Euryscop Series III N°4A witch is upon the Voigtlander catalog a 10"5/6 : 275mm F/4.5
I want to make some Waterhouse stop.
When I mesure the full aperture at the Waterhouse stop place I get 55,5mm
so I found that the full aperture of the lens is more F/4.95 than F/4.5 (275/55,5=4,95)
does it sound right to you ?
Laurent
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