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Terms starting with E

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Exposure & Metering

Exposure

The total amount of light that reaches the sensor or film, set by the combination of aperture, shutter speed and the scene's brightness.

H = E × t lux-seconds (lx·s)
Post-Processing & Retouching

Exposure Adjustment

A processing control that brightens or darkens the whole image in stops, mimicking a change in camera exposure.

stops (EV)
Exposure & Metering

Exposure Compensation

A deliberate offset applied to the camera's metered reading, expressed in stops, to make an image brighter or darker than the meter…

Setting = Metered EV − Compensation stops (EV)
Post-Processing & Retouching

Exposure Fusion

Blending bracketed frames directly into a normal-range image by selecting the best-exposed pixels, without building an HDR file first.

count
Exposure & Metering

Exposure Latitude

How far an exposure can miss the ideal and still produce an acceptable image after processing.

stops
Exposure & Metering

Exposure Simulation

A live-view or electronic-viewfinder mode that displays the scene at the brightness the current settings will actually record.

Exposure & Metering

Exposure Triangle

The teaching model that links aperture, shutter speed and ISO as three interdependent controls, where changing one requires compensating…

Aperture ↔ Shutter ↔ ISO stops
Exposure & Metering

Exposure Value (EV)

A single number describing every combination of aperture and shutter speed that produces the same exposure.

EV = log₂(N² / t) EV
Exposure & Metering

Extended ISO

ISO settings outside a sensor's native range, marked with an L or H prefix, that are produced by digital manipulation rather than analogue…

ISO
Optics, Lenses & Filters

Extension Tube

A hollow spacer placed between lens and camera that shortens the minimum focus distance and increases magnification.

m_added = extension / f mm
Focus & Depth of Field

Eye AF

A refinement of face detection that locates and focuses on the eye itself, and usually lets the photographer choose which one.