Hi David,
Good point... now that you'ved mentioned this, I recall having some pre-Depression folding Kodaks (like a 3-A Autographic) that had the "older" f-scale: 4.5, 6.3, 9, etc... these cameras were American-built, with Bauch & Lomb or Kodak shutters, as opposed to the Kodak-Nagel cameras of the '30s.
Somewhere in the '50s (?) wasn't there a "standardization" on scales for both shutter speeds and aperture scale ?
I have some black Leicas (II s/n 77xxx, III) s/n 117xxx) whose shutter speeds run: Z-20-40-60-100-200-500, (add 1/30 & 1/1000 for my III-f BD)
and f-scales run: 2- 2,2 - 3,2 - 4,5 - 6,3 - 9 - 12,5 (Summar , "feet"s/n 3121xx)
3,5 - 4,5 - 6,3 - 9 - 12,5 - 18 ( Elmar 5cm, "mtr", 999xx)
Moving up to 1953, my Contax IIIa BD (s/n A 606xx) has the following:
shutter: 1 - 2 - 5- 10 - 25 - 50 - 100 -250- 500 - 1250
lens: f: 2 - 2,8 - 4 - 5,6 - 8 - 11 - 16 - 22 (f 2 Sonnar 14496xx)
My 1955 Exatka VX (sorry - "Evil SLR Alert!" 😎)
shutter: B - T - 25 - 50 - 100 - 250 - 500 - 1000
lens: f: 2,8 - 4 - 5,6 - 8 - 11 - 16 ( CZJ Flektogon 2,8 /35 s/n 45709xx)
My 1955-56 V-lander Prominent I ( s/n 80153xx)
shutter: B - 1 - 2 - 5 - 10 - 25 - 50 - 100 - 250 - 500 (Synchro-Compur)
lens: f: 1.5 - 2 - 2,8 - 4 - 5,6 - 8 - 11 - 16 ( Nokton 1,5 / 50 )
Additionally, I have a pre-War (?) Retina I (s/n ?)
shutter: B - 1 - 2 - 5 - 10 - 25 - 50 - 100 - 250 - 500 ( Compur-Rapid )
lens: f: 3,5 - 4,5 - 5,6 - 8 - 11 - 16 (Kodak anast. Ektar 5cm #15628xx)
My "benchmark" user meter is a Gossen Luna-Six, s/n 1039xx (1960's?), whose aperture scale is marked:
f: 1 -1,4 - 2 - 2,8 - 4 - 5,6 - 8 - 11 - 16 - 22 - 32 - 45 - 64 - 90
(with " tick-marks" in between for the "older" stops ?)
Shutter speeds: '2 - '4 - '8 - '15 - '30 - '60 - '125 - '250 - '500 - '1000 - '2000
Wow - I've really gone off into the trees here...
So, are the shutter / aperture markings on the Luna-Six indicative of the "modern", "Universal" systerm for exposure ?
AND, was there ever a VALOO marked with the "old" 3,5 - 4,5 - 6,3 - 9 - 12,5 scale ?
Sorry to be so tedious... 😱
LF