A light meter (or illuminometer) is a device used to measure the amount of light. In photography, an exposure meter is a light meter coupled to either...

internal light meter. As the aperture is adjusted, the opening expands and contracts in increments called f-stops. The smaller the f-stop, the more light is...

Metering may refer to: Measuring instrument: Device for measuring a physical quantity. Ramp meter: Device; usually a basic traffic light or a two-section...

and Steinheil. A high-quality Tessar lens was made by Zeiss. Rollei's light meter supplier was Gossen. Whether to use either a photovoltaic selenium sensor...

the bright halo around the body and hairline. Spot metering allows the camera to measure the light reflected from the person's face and expose properly...

In photography, through-the-lens metering (TTL metering) refers to a feature of cameras whereby the intensity of light reflected from the scene is measured...

angle Light meter, an instrument used to set photographic exposures. It can be either a lux meter (incident-light meter) or a luminance meter (reflected-light...

A ramp meter, ramp signal, or metering light is a device, usually a basic traffic light or a two-section signal light (red and green only, no yellow) together...

selenium meter is a light-measuring instrument based on the photoelectric properties of selenium. The most common use of such light meters is measuring...

systems. Other general purpose light power measuring devices are usually called radiometers, photometers, laser power meters (can be photodiode sensors or...