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Terms starting with T

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Film, Darkroom & Historic Processes

T-grain Emulsion

An emulsion using flat, tabular silver crystals that present a larger surface area to light for a given volume.

Exposure & Metering

T-stop

A measured aperture value that accounts for the light a lens actually transmits, rather than the geometric ratio an f-number implies.

T = N / √(transmittance) T-stops
Optics, Lenses & Filters

Telecentric Design

A lens design in which light rays strike the sensor nearly perpendicular across the whole frame rather than at increasing angles toward the…

Optics, Lenses & Filters

Teleconverter

A supplementary optic mounted between lens and body that multiplies focal length at the cost of light and, usually, sharpness.

N_new = N × magnification × magnification
Optics, Lenses & Filters

Telephoto Lens

A lens with a focal length longer than the format's diagonal, magnifying distant subjects and narrowing the angle of view.

mm
Printing, Display & Output

Test Print

A small print, often of selected crops, made to evaluate colour, tone and sharpening before committing to full size.

Film, Darkroom & Historic Processes

Test Strip

A piece of paper exposed in bands at increasing times, used to determine the correct exposure for a print.

seconds
Files, Metadata & Workflow

Tethered Shooting

Connecting a camera directly to a computer so images transfer as they are captured.

Composition & Visual Design

Texture

The tactile surface quality of a subject as revealed by light, giving a sense of how something would feel.

Post-Processing & Retouching

Texture Slider

A control that increases or decreases medium-scale detail while deliberately leaving very fine detail and broad tones alone.

%
Genres, Movements & Theory

The Decisive Moment

The idea that in any unfolding event there is a single instant at which form and content align most expressively.

Genres, Movements & Theory

The Family of Man

A 1955 exhibition at New York's Museum of Modern Art presenting 503 photographs from 68 countries as evidence of shared human experience.

count
Genres, Movements & Theory

The Gaze

A critical concept describing how looking is structured by power, and how images position their subjects and viewers.

Exposure & Metering

Third Stop

A one-third-stop increment, the fine adjustment step most digital cameras use for aperture, shutter speed, ISO and exposure compensation.

⅓ stop = ×2^(1/3) ≈ ×1.26 stops (EV)
Lighting & Flash

Three-point Lighting

The standard setup of key, fill and rim lights that models a subject and separates it from the background.

Files, Metadata & Workflow

TIFF

A flexible, usually lossless raster format widely used for master files, scanning and print submission.

MB
Optics, Lenses & Filters

Tilt-shift Lens

A lens that can be tilted or shifted relative to the sensor, controlling the plane of focus and correcting converging verticals.

Scheimpflug: subject, lens and film planes meet on a line degrees, mm
Motion, Video & Creative Techniques

Tilt-shift Miniature Effect

An extreme selective focus that makes a full-size scene appear to be a scale model.

Exposure & Metering

Time Mode

A shutter setting, marked T, that opens the shutter on one press of the release and closes it on a second.

seconds
Motion, Video & Creative Techniques

Time-lapse

A sequence of frames captured at long intervals and played at normal speed, compressing hours into seconds.

Clip length = frames / playback fps seconds interval
Motion, Video & Creative Techniques

Timecode

A frame-accurate time reference recorded with footage, used to synchronise multiple cameras and audio recorders.

HH:MM:SS:FF hh:mm:ss:ff
Colour & Colour Management

Tint

The white balance axis running from green to magenta, correcting casts that colour temperature alone cannot address.

tint units
Film, Darkroom & Historic Processes

Tintype

A wet collodion positive made on a thin sheet of blackened iron, producing a cheap, durable, unique image.

Colour & Colour Management

TLCI

The Television Lighting Consistency Index, a scoring system that evaluates a light source using a model of a camera's response rather than…

Qa score