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...

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...

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...

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...

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...

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

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...

estimating correct daylight exposures without a light meter. Apart from the advantage of independence from a light meter, the sunny 16 rule can also aid in achieving...

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...

illuminance". Exposure meter calibration is discussed in detail in the Light meter article. APEX system Exposure compensation Exposure meter calibration High-dynamic-range...

full-scene averaging, cadmium sulfide (CdS)battery light meter versus the actual camera settings. The meter does not have an on/off switch and the lens cap...

A side-effect of the FT's light meter was a dimmer viewfinder. The Pen FV was essentially a Pen FT with the light meter deleted and the F's brighter...

400 sets were manufactured). With added integral TTL light meter. First Leica with a light meter, a mechanical swinging-arm CDS cell positioned behind...

lenses as the Nikon F series cameras. The light meter indicates current whose value depends on the amount of light, and three user settings: aperture, shutter...

components of other kinds of analog meters (e.g., light meters and VU meters), capturing the outputs of these meters' sensors. Today, the main type of galvanometer...

useless for in-camera light metering. Built-in light metering with SLRs started with clip-on selenium cell meters. One such meter was made for the Nikon...

eyepiece blind. However, the FA's real claim to fame was the AMP meter. AMP used a light meter with two segmented silicon photodiodes to divide the field of...

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

the first camera to place the light meter behind the lens for more accurate metering. However, through-the-lens metering ultimately became a feature more...

The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined...

300 (which had a light meter), the 400 (which had a light meter and a spring driven film advance), and the 700 (which had a light meter and adjustable focus...

Through The Lens (TTL) light metering, originally it was supposed to be a Spot meter but it ended up being a center-weighted meter. This camera allowed...

Solar cell Avalanche photodiode Transducer LEDs as photodiode light sensors Light meter Image sensor Transimpedance amplifier Photoelectric sensor  This...

called K/AR mount. PX675 type mercury batteries are only needed for the light meter. Shutter speeds run from 1s to 1/1000 and B. Lenses, Konica named them...

A smart meter is an electronic device that records information—such as consumption of electric energy, voltage levels, current, and power factor—and communicates...

An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed...

focal-plane shutter rangefinder system camera with an integrated selenium light meter introduced by Canon Inc. in September 1961, the last model compatible...

readings of the built-in silicon photocell light meter. It supports one metering mode, centerweighted average metering. The focusing screen also has Canon's...

Nikkor types, will mount but require stop down metering. The F2 with plain/eye-level DE-1 prism (no light meter; see below) will work with either lens types...