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Forums Lobby MASTER YOUR NIKON CAMERA Nikon D90/D80/D70 (Public) topic #251815
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Subject: "RE: Aperture/Shutter Priority and EV" Previous topic | Next topic
aolander Silver Member  Nevis, US  Nikonian since 15th Sep 2006 Tue 11-Sep-12 07:23 PM
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#1. "RE: Aperture/Shutter Priority and EV"
In response to In response to 0
Tue 11-Sep-12 07:42 PM by aolander


"Exposure value (EV) denotes all combinations of a camera's shutter speed and relative aperture that give the same exposure." (Wikipedia definition)

You're using a different EV if you select an aperture/shutter speed combination that doesn't give you the same exposure. It doesn't matter whether the change is made with the aperture or the shutter speed.

For example, if the the "correct" exposure for a scene requires f/8 at 1/125, then f/5.6 at 1/250 and a number of other combinations will all give you the same ("correct") exposure. These are all EV 13. If you use f/5.6 and 1/125 to move your histogram to the right, you would be using EV 12, but f/8 at 1/60 would also be EV 12; i.e. both give the one more stop of exposure, both are EV 12. You changed the EV in one case with the aperture, the other with the shutter speed.

(The ISO remains constant in all of these examples.)

Alan

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This is a hot, active topic!Aperture/Shutter Priority and EV [View all] , DBarnes Silver Member, Tue 11-Sep-12 05:51 PM
 
Subject Author Message Date ID
Reply message RE: Aperture/Shutter Priority and EV aolander Silver Member
11th Sep 2012
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Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
12th Sep 2012
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     Reply message RE: Aperture/Shutter Priority and EV aolander Silver Member
12th Sep 2012
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     Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
14th Sep 2012
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          Reply message RE: Aperture/Shutter Priority and EV briantilley Moderator Deep knowledge of bodies and lens; high level photography skills Donor Ribbon awarded for his support to the Fundraising Campaign 2014
14th Sep 2012
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          Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
14th Sep 2012
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               Reply message RE: Aperture/Shutter Priority and EV briantilley Moderator Deep knowledge of bodies and lens; high level photography skills Donor Ribbon awarded for his support to the Fundraising Campaign 2014
14th Sep 2012
16
                    Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
14th Sep 2012
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                         Reply message RE: Aperture/Shutter Priority and EV kentak Silver Member
15th Sep 2012
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          Reply message RE: Aperture/Shutter Priority and EV kentak Silver Member
14th Sep 2012
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          Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
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          Reply message RE: Aperture/Shutter Priority and EV aolander Silver Member
14th Sep 2012
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               Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
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     Reply message RE: Aperture/Shutter Priority and EV Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Writer Ribbon awarded for his contributions to the Nikonians Resources articles library
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Reply message RE: Aperture/Shutter Priority and EV Arkayem Moderator Awarded for his high level skills in flash photography
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Reply message RE: Aperture/Shutter Priority and EV Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Writer Ribbon awarded for his contributions to the Nikonians Resources articles library
14th Sep 2012
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Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
14th Sep 2012
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Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
14th Sep 2012
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     Reply message RE: Aperture/Shutter Priority and EV aolander Silver Member
14th Sep 2012
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          Reply message RE: Aperture/Shutter Priority and EV Arkayem Moderator Awarded for his high level skills in flash photography
14th Sep 2012
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          Reply message RE: Aperture/Shutter Priority and EV DBarnes Silver Member
14th Sep 2012
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Forums Lobby MASTER YOUR NIKON CAMERA Nikon D90/D80/D70 (Public) topic #251815 Previous topic | Next topic