Derval
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| Gauthier Derval, Dial-set variant image by Luis Cozeto (Image rights) |
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.
The Derval can have either a dial-set or a rim-set shutter speed setting.
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| Nettar (515/2) with Derval shutter, Rim-set variant image by John-Henry Collinson (Image rights) |
Notes
- ↑ Zeiss Ikon brochure (German) "Jetzt knipsen mit Cameras von Zeiss Ikon" 1939, page 7
