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Exposure value
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==Setting EV on a camera== [[File:Kodak Retina Ib with EV.jpg|thumb|left|Detail of front of Kodak Retina Ib 35mm camera ({{Circa|1954}}) showing the EV setting ring that couples aperture and shutter speed settings]] [[File:Kodak Pony II Camera.jpg|left|thumb|A Kodak Pony II camera (1957–1962) with exposure value setting ring. This camera has a fixed shutter speed, so the "EXP VALUE" ring simply sets the aperture.]] On most cameras, there is no direct way to transfer an EV to camera settings; however, a few cameras, such as some [[Voigtländer]] and [[Carl Braun Camera-Werk|Braun]] models or the [[Kodak]] Pony II shown in the photo, allowed direct setting of exposure value. [[File:Hasselblad with Planar 80mm at EV 12.jpg|right|thumb|Hasselblad Planar 80mm with EVS set at EV 12]] 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 ([[#CITEREFRay2000|Ray 2000]], 318). On some lenses the locking was optional, so that the photographer could choose the preferred method of working depending on the situation. Use of EV on some meters and cameras is discussed briefly by [[#CITEREFAdams1981|Adams (1981]], 39). He notes that, in some cases, the EV indication from the meter may need to be adjusted for film speed.
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