eospaddy Loc: Liverpool UK

slightly technical answer and i wont pretend to no what it all meant but regards to different combinations resulting in the same exposure i get and for the most part i don't think i will even use it ( E.V ) but i did want to no what was changing in the photographic triangle if you like, and with the kind help from you guys i have a fair grasp of the E.V know, thanx for your input

GHK Loc: The Vale of Eden

Presumably the selection was being affected by some other setting which you had selected in the background.
GHK

GHK Loc: The Vale of Eden

I agree that there is no need to use EV in a practical way; I don't. It's a good idea to know it exists though, because, as I indicated, some people use the term much more loosely.
GHK

eospaddy Loc: Liverpool UK

go figure, lol, but eh thats a interesting one, but we know also now it will alter either or just depending on the scenario. thanx for chipping in with that

n3eg Loc: West coast USA

We electronics types who deal with db and dbm understand it just fine.

rebride

Your right. It was in 400% DR.
My camera only does EV compensation when in Auto, but there are other settings i.e. dynamic range, hi and low contrast etc which can be applied when in Auto, which does some sort of tone mapping.
Though it still seems to favor aperture in + and shutter speed in - it does a either/or combo f/stop/shutter speed depending on ????.
Interesting.

billybaseball Loc: Bel Air MD

If you are changing the exposure compensation in the camera you are changing the brightness at which the camera processes the image, you are not changing any of the three legs of exposure.

billybaseball Loc: Bel Air MD

This is absolutely correct. Changing the exposure compensation changes how the camera processes the raw image into a jpg, it does not change your settings. Try shooting raw and see if what happens.

rebride

Depends on camera how it all works.

Bmac Loc: Long Island, NY

Of course you are, here is yet another site that explains what happens when you adjust exposure compensation.

If you are using a basic compact camera and you want your pictures lighter or darker, just change the Exposure Compensation EV+/- to your desired setting. The camera will automatically choose a shutter speed and aperture to
adjust the exposure.

If you are a Digital SLR user, you can use the Exposure Compensation feature in the Aperture Priority, Shutter Priority and Program modes. If you use the Exposure Compensation EV+/- feature in the program mode, the camera will automatically choose a combination of the shutter speed and lens aperture settings that will lighten or darken the image. (the amount of extra brightness of darkness of the image will be dependent upon on the EV+/- setting that you
choose.)

If you are using the Shutter Priority mode, when you change the EV+/- settings, the camera will change the lens aperture setting to lighten or darken the picture accordingly. The shutter speed will remain constant.

When you use the Aperture Priority mode, the camera will adjust the Shutter Speed when the EV+/- setting is changed. In that case, the lens aperture setting will remain constant.

From:http://easybasicphotography.com/exposure-compensation-ev.html

infocus Loc: Australia

You're quite right. I did NOT read the question that way in the first place but you're correct. My apologies.

BHC Loc: Strawberry Valley, JF, USA

http://www.fredparker.com/ultexp1.htm
2-3 pages down. Excellent treatise on Exposure Value.

lighthouse Loc: No Fixed Abode

From a cursory glance at my camera (5D2)
Shutter priority changes aperture.
Aperture priority changes shutter speed.
P mode changes both - seemingly in step with each other.
There are more ways of doing it but I didn't want to dig into the menus.

GrahamS Loc: Hertfordshire, U.K

This is completely incorrect. Disregard.

georgevedwards Loc: Essex, Maryland.

Wait a minute, wasn't it just established that you can't use the EV button when in Manual?