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Forums Lobby CAFÉ English Café (Public) topic #1527
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Subject: "RE: EV" Previous topic | Next topic
f5fstop Awarded for his contributions to the Resources   Private, UM  Basic Member Sat 21-Jul-01 01:28 AM
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#2. "RE: EV"
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EV can be explained as the range of combinations of shutter speeds and aperture values that correspond to the same final exposure. If you number these ranges, you have EV (Exposure Values).
An EV of zero will correspond to the exposure time of one second and the aperture of F/1.0. EV 1 is either a half second and F/1.0 or one-second and F/1.4 and so on.
If you combine the exposure value with a specific film speed, EV numbers can be used to indicate the brightness of an object. Without the addition of film speed into the equation, exposure values indicate nothing more than camera settings.
Most camera manufacturers use EV to indicate the sensitivity of their AF and metering systems. The Nikon F5 has an AF detection range of EV –1 to EV +19 and a metering range of EV 0 to EV 20 (at a rated 100 ISO). Now, if you mounted a lens with an aperture of F/1.4 to the camera the metering system would be accurate between EV 0 to EV20. However, if you mount a lens with an aperture of F/2.8 the meter now senses three stops less light than with the F/1.4 lens so the metering system is now accurate between EV 3 to EV 23. (All EV ranges are rated at 100 ISO).
It is quite easy to set up a chart in excel to set up EV ranges. However, to try to explain it here could take some time. If you would like I have an EV chart in an excel file that I would be happy to email to you.

Doug


--Take only photographs, leave nothing but footprints--


NC, second week of October, 2001...



"Take only photographs, leave only footprints"
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A general, generic topicEV; What is it and how does it work? [View all] , mbowker64 Silver Member, Fri 20-Jul-01 10:33 PM
 
Subject Author Message Date ID
Reply message RE: EV photodoc
21st Jul 2001
1
Reply message RE: EV f5fstop Awarded for his contributions to the Resources
21st Jul 2001
2
     Reply message RE: EV mbowker64 Silver Member
21st Jul 2001
3
          Reply message RE: EV f5fstop Awarded for his contributions to the Resources
21st Jul 2001
4

Forums Lobby CAFÉ English Café (Public) topic #1527 Previous topic | Next topic