BUILT-IN LIGHT METER - A reflective exposure meter that is a built-in component of a camera.
A built-in light meter will try to produce an exposure made up of average midtones. A dark scene that's been exposed so it's dominated by midtones will therefore look over-exposed.
Mid-tone scenes ...
A camera's built-in light meter can easily be tricked into giving an incorrect exposure. The most common problem is a bright background behind the subject such as a bright sky, or bright light reflecting off snow, sand or water.
Digital SLRs have built-in light meters that calculate the required exposure settings to expose the object you're pointing the camera at as a medium tone.
Most 35mm SLRs have a built-in light meter that reads through the lens (TTL). The light meter may read the light falling on the mirror, the shutter curtain, the focusing screen, or even on the film at the instant of exposure.
The camera has a built-in light meter and computer that measures available light and sets exposure for you. A feature on moderately-priced to expensive cameras.
You will need to make allowances for the loss of light due to the extended tube unless you are using your camera's built-in light meter (most photographers do).
A body cap is easily available through ebay. Search for your camera model and "body cap.
If you just "meter the scene" your camera's built-in light meter will read all that snow as an 18% gray tone. The snow will look gray and everything else in the picture darker than the snow will look black.
We've had a lot of questions from students about using their camera's built-in light meter. Here's an overview which we hope will give you a basic understanding of the subject.
Manual SLR cameras have a built-in light meter to help you do this. The main component of the light meter is a panel of semi-conductor light sensors that are sensitive to light energy.
In this episode, Mark shows you how to activate the built-in light meter in your speedlight for use on a lightstick.
1) If you use a handheld light meter (a separate device from the camera) instead of the camera's built-in light meter then you will obviously need to compensate for the presence of a filter.
Today, most cameras automatically determine the correct exposure at the time of taking a photograph by using a built-in light meter, or multiple point meters interpreted by a built-in computer, see metering mode.
Simple: because monkeys are cute, and because pro cameras, like 4x5s, still don't have built-in light meters.
If they are moving more slowly, don't be afraid to go all the way to a 2 or 3 second exposure. Once I set my shutter speed, I use my camera's built-in light meter to set the corresponding aperture.
 See also: Photograph, Image, Exposure, Camera, Light meter
  
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