# Exposure values

Discussion in 'Digital Photography' started by Don, Aug 13, 2005.

1. ### DonGuest

Folks

I understand F stops and their use etc. Can somebody give me an idiots
guide to exposure value. I can extract this figure using my light meter but
am not sure what and how its best used for still photography. Look forward
to all information as always.

--
Don From Down Under

Don, Aug 13, 2005

2. ### dylanGuest

"Don" <> wrote in message
news:C0jLe.82648\$...
> Folks
>
> I understand F stops and their use etc. Can somebody give me an idiots
> guide to exposure value. I can extract this figure using my light meter
> but am not sure what and how its best used for still photography. Look
> forward to all information as always.
>
> --
> Don From Down Under
>

to get you started...

http://www.chem.helsinki.fi/~toomas/photo/ev.html
http://www.digicamhelp.com/what-is-exposure-compensation/exposure-value-settings.htm
http://www.dpreview.com/learn/?/Glossary/Exposure/Exposure_01.htm
http://www.jackspcs.com/evzones.htm

dylan, Aug 13, 2005

3. ### Don StaufferGuest

Don wrote:
> Folks
>
> I understand F stops and their use etc. Can somebody give me an idiots
> guide to exposure value. I can extract this figure using my light meter but
> am not sure what and how its best used for still photography. Look forward
> to all information as always.
>

Essentially, EV is related to the amount of energy striking the focal
plane. The meter reads EV, and you have a choice of shutter speeds and
apertures that give you that exposure. The exposure is proportional to
T/(f/#)squared- T divided by the square of the f/#. That is a bit hard
to figure in your head, so there are circular "slide rules" that do the
computation for you, showing which combinations of shutter speed and
aperture expose properly for the EV for a given film speed. Many light
meters used to have such "slide rules" built onto the meter.

Don Stauffer, Aug 13, 2005
4. ### DonGuest

Thanks all

regards

Don
"Don Stauffer" <> wrote in message
news:AGnLe.6\$...
> Don wrote:
>> Folks
>>
>> I understand F stops and their use etc. Can somebody give me an idiots
>> guide to exposure value. I can extract this figure using my light meter
>> but am not sure what and how its best used for still photography. Look
>> forward to all information as always.
>>

>
>
> Essentially, EV is related to the amount of energy striking the focal
> plane. The meter reads EV, and you have a choice of shutter speeds and
> apertures that give you that exposure. The exposure is proportional to
> T/(f/#)squared- T divided by the square of the f/#. That is a bit hard to
> figure in your head, so there are circular "slide rules" that do the
> computation for you, showing which combinations of shutter speed and
> aperture expose properly for the EV for a given film speed. Many light
> meters used to have such "slide rules" built onto the meter.

Don, Aug 14, 2005

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