Exposure Meters
An exposure meter is a device that determines how much light the film should receive to make a correctly exposed print that is neither too dark nor too light.
Exposure meters and light readings
The precise level of available light is best measured by using a light meter. This can be either a hand held meter or one built into the camera.
Exposure meters that measure a scene's light are available to help a photographer calculate the appropriate exposure necessary for a given scene.
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Cameras and exposure meters can take readings of the light levels in a number of ways, from basic to advanced methods. The most basic is Centre-weighted (CW) or average metering that takes a measurement from most of the image area.
If built-in exposure meters are as sophisticated as camera manufacturers claim, why do people still get poorly exposed pictures? The truth is that while most built-in meters are fabulously accurate, they can be fooled.
Exposure meters for measuring incident light can be used directly to help determine lighting ratios. A gray card is used to get an accurate exposure reading whenever reflected light meter readings are taken.
Every photographer is familiar with ISO speeds, those numbers we dial into our exposure meters and cameras so they can lead us-albeit, sometimes somewhat circuitously-to properly exposed images.
Peterson stresses the importance of metering the subject for a starting exposure and then explains how to use various exposure meters and different kinds of lighting.
Exposure meters may be built into the camera or be completely separate units.
Exposure meters in cameras try to make everything a medium tone (think green leaves---that's medium tone). If you're trying to take a photo that's bright, the camera will still try to render it medium tone.
Two types are used in exposure meters. A selenium cell generates electricity in proportion to the amount of light falling upon its surface. A cadmium sulfide cell offers a resistance to a small electric charge when light falls upon it.
12-1961 American Standard General-Purpose Photographic Exposure Meters (Photoelectric Type) specifies that "The symbol for relative apertures shall be f/ or f : followed by the effective f-number.
Because P&S cameras tend to have less well developed exposure meters and less manual control it is far more preferable to use print film rather than slide through them as any exposure variations can be ‘ ...
Printing ancillaries like lint free cotton gloves, glass rods for stirring, printing scale wedges, dodging and burning equipment for color finishing of photographs, exposure meters or timers, funnels, safety photographic paper containers, ...
Cadmium sulfide cell (CdS)
Photo responsive cell used in exposure meters. Fed by an electric current, its electrical resistance varies according to the quantity of light it receives.
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But to exposure meters, which are biased toward the middle tones, clouds appear gray. To correctly photograph a cloud, you need to increase the meter's recommendation by ½ to 1 ½ stops.
-Cadmium sulfide cell (CdS) - photo-sensitive cell used in exposure meters. Fed by an electric current from a battery, its electrical resistance varies according to the amount of light it receives.
May be this extra will help, photo conductive material used in exposure meters as alternative to selenium-based or silicon blue photocells. Its electrical resistance decreases as the light falling on it increases.
Exposure meters measure the overall amount of reflected light from the subject. This level of light is then rendered as 18% gray in the picture. It will give a perfectly exposed image for scenes that contain mainly average gray tones.
REFLECTED LIGHT READING - An exposure meter reading of light reflected by a subject. The exposure meters in most cameras are reflected light meters.
Exposure meter (light meter). An instrument that measures the amount of light and provides aperture and shutter speed combinations for correct exposures. Exposure meters may be built into the camera or they may be separate instruments.
The light value, denoted LV, refers to how bright a subject is in absolute terms, meaning how much light is coming from a subject, called its luminance. Pointing directly at the subject, some exposure meters give readings plainly in LV numbers.
Photodiode
A semiconductor which measures or converts light into an electrical current. Photodiodes are commonly used in scanners, CCD sensors, and exposure meters.
the exposure indicated for an average subject and/or processing should be multiplied to allow for non-average conditions. Usually applied to filters, occasionally to lighting, processing etc. Not normally used with through-the-lens exposure meters.
half way for five seconds and focus cycled from infinity to minimum range once with each shot; built-in Speedlight fired at full power with every other shot; AF-assist illuminator lights when Speedlight is used; cycle repeated once exposure meters ...
 See also: Exposure, Meter, Exposure meter, Light, Photograph
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