Continental (German) aperture scale
Pre-1960 European full-stop scale, alongside or in place of the modern ISO scale.
Where to find it
Viewfinder Aperture chip Continental scale section
Summary
Continental ('German') full stops: f/1.1, f/1.6, f/2.2, f/3.2, f/4.5, f/6.3, f/9, f/12.5, f/18, f/25, f/36, f/50. Match the engraved scales on Voigtländer Color-Skopar, early Zeiss Jena Tessar, and other pre-1960 European lenses. The Aperture dialog carries a master toggle plus a Replace / Add-to-modern sub-mode, so you can either swap the modern scale out entirely or keep both lists side by side.
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How it works
What the scale is
The continental or 'German' full-stop scale predates the modern ISO scale and was engraved on European lenses through roughly 1960. Each stop divides the previous by the square root of 2.5 instead of the square root of 2, so the values land on f/1.1, f/1.6, f/2.2, f/3.2, f/4.5, f/6.3, f/9, f/12.5, f/18, f/25, f/36, and f/50 instead of the modern f/1.4, f/2, f/2.8, f/4, f/5.6, and so on.
When to turn it on
Shooting a vintage European camera with the original aperture ring still engraved in continental stops. Voigtländer, Schneider, early Zeiss Jena, certain Rollei TLR generations, and the older Compur and Prontor shutters all used the German scale. With the toggle on, the meter's recommendations land on the same numbers your lens actually displays.
Replace vs Add to modern
Replace modern shows only the continental list, so a FULL-stop picker reads f/1.1, f/1.6, f/2.2, and so on. Add to modern keeps the modern values and inserts the continental stops between them, so both scales appear together. Pick Replace when the lens you are using has only continental engravings and you want a clean wheel; pick Add when you want to see how the two scales line up.
Half and third stops are unaffected
The continental setting changes the FULL-stop list only. If you toggle increments to HALF or THIRD, the picker returns to the modern intermediate values (f/1.2, f/1.7, f/3.5, and so on) because the continental scale does not define fine intermediates. Switch back to FULL to see the German stops again.
Where the toggle lives
Open the Aperture dialog from the Viewfinder (tap the aperture chip). Under the Custom button you will find a Continental scale section: a master switch on the right, plus Replace modern and Add to modern chips that appear whenever the master is on. Both choices are saved to your profile and survive app restarts.