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Lighting & Flash

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Lighting & Flash

Hard Light

Light from a source that is small relative to the subject, producing sharply defined shadows with abrupt edges.

Lighting & Flash

High-key Lighting

A lighting approach in which most tones sit in the upper half of the range, with few dark shadows and a bright background.

Lighting & Flash

High-speed Sync

A flash mode that fires a rapid train of pulses during the whole travel of the shutter slit, allowing flash above the normal sync speed.

stops lost
Lighting & Flash

Honeycomb Grid

A cellular insert placed over a light that narrows its beam by absorbing rays travelling at wide angles.

degrees (10°, 20°, 30°, 40°)
Lighting & Flash

Inverse Square Law

The rule that light from a point source falls off in proportion to the square of the distance, so doubling the distance quarters the…

E ∝ 1 / d² stops (EV)
Lighting & Flash

Key Light

The dominant light in a setup, which establishes the direction of the shadows and the overall exposure.

f-stops (EV)
Lighting & Flash

LED Panel

A flat array of light-emitting diodes providing continuous, dimmable and often colour-adjustable illumination.

lux at 1 m
Lighting & Flash

Light Falloff

The rate at which illumination decreases with distance from the source, across the subject or into the background.

E ∝ 1 / d² stops (EV)
Lighting & Flash

Lighting Ratio

The relationship between the illumination on the lit side of a subject and that on the shadow side, expressed as a ratio or in stops.

Ratio = (key + fill) : fill ratio / stops
Lighting & Flash

Loop Lighting

A portrait pattern in which the nose casts a small loop-shaped shadow onto the cheek without touching the cheek shadow.

Lighting & Flash

Low-key Lighting

A lighting approach in which most tones sit in the lower half of the range, with a small lit area surrounded by darkness.

Lighting & Flash

Manual Flash

Setting flash output as a fixed fraction of full power, so every frame receives an identical burst.

Power = full / 2ⁿ fraction (1/1, 1/2, 1/4…)
Lighting & Flash

Modelling Light

A continuous lamp built into a flash head that previews where the shadows will fall.

W
Lighting & Flash

Monolight

A self-contained studio flash with its power supply, controls and modelling lamp built into a single head.

Ws (watt-seconds)
Lighting & Flash

Octabox

An eight-sided softbox whose near-circular shape produces round catchlights and even wrap-around light.

cm
Lighting & Flash

Open Shade

An area shielded from direct sun but open to a large expanse of sky, giving soft, even illumination.

Lighting & Flash

Optical Slave

A sensor that fires a flash when it detects the light from another flash.

m (range)
Lighting & Flash

Practical Light

A light source that appears within the frame as part of the scene, such as a lamp, candle or neon sign.

Lighting & Flash

Radio Trigger

A transmitter on the camera and receivers on the flashes that fire them by radio signal.

m (range)
Lighting & Flash

Rear-curtain Sync

A setting that fires the flash at the end of the exposure rather than the beginning, so motion trails follow the subject rather than…

Lighting & Flash

Recycle Time

The interval a flash needs to recharge its capacitor to full power after firing.

seconds
Lighting & Flash

Reflector

A panel that bounces existing light back into the shadows, adding fill without a second light source.

stops
Lighting & Flash

Rembrandt Lighting

A portrait pattern in which a small triangle of light appears on the shadowed cheek, below the eye.

Lighting & Flash

Rim Light

A light placed behind and to one side of the subject that draws a bright edge along its outline, separating it from the background.

f-stops (EV)