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Photography Question 
Claudia M. Barrios

Light Meter

What three settings can be entered/adjusted in a light meter?

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1/4/2008 2:52:28 PM

Gregory LaGrange
BetterPhoto Member Since: 11/11/2003
  This a homework question?

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1/4/2008 2:55:16 PM

Claudia M. Barrios   well in a way it is, you see i'm only 16 and I am begining to take some courses on photography, and my teacher,Daniel Zealand would like for us to know so he won't tell us.

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1/4/2008 3:00:08 PM

Gregory LaGrange
BetterPhoto Member Since: 11/11/2003
  Well, there's got to be a text book that you're also supposed to read. So I'll give you a hint instead of doing it for you.
It's things that can also be adjusted on a camera.
If you don't get it, then I'll make fun of you.

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1/4/2008 3:14:34 PM

Claudia M. Barrios   oh! allright! I think I got them! thanks

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1/4/2008 3:47:47 PM

Alan N. Marcus   Hi Claudia,

First one enters the sensitivity of the film you will be using or if the camera is digital, the sensitivity setting of the digital imaging chip. Your camera’s chip is likely called a CCD which stands for Charged Coupled Device. The value you are setting is called the ISO (abbreviation for International Standards Organization). Generally this value will be 100. Faster, more light sensitive films and chips are given higher values like 200 ISO or 400 ISO or 800 ISO etc.

Next we use the light meter and measure the brightness of the subject we wish to photograph. The meter reading you receive is a numeric value that that represents this brightness as an exposure value..

You use this data (exposure value) to determine what exposure combination you will use. The exposure combination is made up of pairs of data. Each pair consists of a shutter speed and a lens aperture setting. The shutter speed is the time the shutter remains open thus it sets a limit on the time the light passing through the lens will be allowed to play on the film/chip. The aperture setting controls the camera lens. The lens has an adjustable diameter. Larger diameters allow more light to enter; smaller diameters reduce the light allowed to enter. The meter will present several of these pairs of data. All will be equal as to exposure but each pair will be a different shutter speed and lens aperture combination.

Your input is required to select which pair is best for this situation. You would choose a small aperture (large f/number) to gain depth-of-field). You would choose a fast shutter speed to stop action at a sporting event.

Thus: You input the ISO setting
You choose a pair of settings that comprise aperture and shutter speed.

Hope this helps,

Alan Marcus

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1/4/2008 8:58:58 PM

Christopher A. Walrath
BetterPhoto Member Since: 4/25/2006
  Nice snag there, Greg. If this was a new post, I was right on with ya.

Thank you.

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1/7/2008 4:42:41 PM

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