Exposure & Metering

The working f-number of a lens once it is focused close, which is always darker than the marked aperture because the lens is extended away…

N_eff = N × (1 + m) f-stops (EV)

Exposure & Metering

Any different combination of aperture, shutter speed and ISO that yields identical image brightness.

N₁²/t₁ = N₂²/t₂ stops (EV)

Exposure & Metering

A metering pattern that divides the frame into zones, compares their brightness against a database of scene types, and infers the…

Exposure & Metering

The technique of exposing as brightly as possible without clipping, then darkening in processing to maximise signal-to-noise ratio.

stops (EV)

Exposure & Metering

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)

Exposure & Metering

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)

Exposure & Metering

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

stops

Exposure & Metering

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

Exposure & Metering

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

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

EV = log₂(N² / t) EV

Exposure & Metering

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