Derval
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The Derval is a 2-leaf shutter with speeds 1/25, 1/50 and 1/100 second, plus 'B' and 'T' modes[1].
The Derval was produced by the German company Gauthier.
It is an everset shutter meaning that there is no separate tensioning action necessary. Just operating the release suffices.
References
- ↑ Zeiss Ikon brochure (German) "Jetzt knipsen mit Cameras von Zeiss Ikon" 1939, page 7
