Setting EV On A Camera
On most cameras, there is no direct way to transfer an EV to camera settings; however, a few cameras, such as some Voigtländer and Braun models or the Kodak Pony II shown in the photo, allowed direct setting of exposure value.
Some medium-format cameras from Rollei (Rolleiflex, Rolleicord models) and Hasselblad allowed EV to be set on the lenses. The set EV could be locked, coupling shutter and aperture settings, such that adjusting either the shutter speed or aperture made a corresponding adjustment in the other to maintain a constant exposure. On some lenses the locking was optional, so that the photographer could choose the preferred method of working depending on the situation. Use of the EV scale on Hasselblad cameras is discussed briefly by Adams (1981), 39).
Read more about this topic: Exposure Value
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