nikonians

Even though we ARE Nikon lovers,we are NOT affiliated with Nikon Corp. in any way.


Sign up Login
Home Forums Articles Galleries News Workshops Shop Recommended
members
All members Wiki Contests Vouchers Apps Newsletter THE NIKONIAN™ Magazines Podcasts Fundraising

Aperture/Shutter Priority and EV

aolander

Nevis, US
3634 posts

Click to send email to this author Click to send private message to this author

"RE: Aperture/Shutter Priority and EV"

aolander Silver Member Nikonian since 15th Sep 2006
Tue 11-Sep-12 07:23 PM | edited 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

Visit my Nikonians gallery.

Visit my Nikonians gallery.

This is a hot, active topic! Aperture/Shutter Priority and EV [View all] , DBarnes Silver Member, Tue 11-Sep-12 05:51 PM
Subject
ID
Reply message RE: Aperture/Shutter Priority and EV
1
Reply message RE: Aperture/Shutter Priority and EV
2
     Reply message RE: Aperture/Shutter Priority and EV
3
     Reply message RE: Aperture/Shutter Priority and EV
4
          Reply message RE: Aperture/Shutter Priority and EV
5
          Reply message RE: Aperture/Shutter Priority and EV
11
               Reply message RE: Aperture/Shutter Priority and EV
16
                    Reply message RE: Aperture/Shutter Priority and EV
18
                         Reply message RE: Aperture/Shutter Priority and EV
21
          Reply message RE: Aperture/Shutter Priority and EV
6
          Reply message RE: Aperture/Shutter Priority and EV
12
          Reply message RE: Aperture/Shutter Priority and EV
7
               Reply message RE: Aperture/Shutter Priority and EV
13
     Reply message RE: Aperture/Shutter Priority and EV
10
Reply message RE: Aperture/Shutter Priority and EV
8
Reply message RE: Aperture/Shutter Priority and EV
9
Reply message RE: Aperture/Shutter Priority and EV
15
Reply message RE: Aperture/Shutter Priority and EV
14
     Reply message RE: Aperture/Shutter Priority and EV
17
          Reply message RE: Aperture/Shutter Priority and EV
19
          Reply message RE: Aperture/Shutter Priority and EV
20