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Photography Glossary

T or T Setting
Used for long time exposures. At the T setting, the shutter remains open until it is manually closed by rotating the shutter speed dial.
Teleconverter
An optical system mounted between the camera body and the lens to increase the effective focal length of the lens.
Telephoto Lens
A specific type of long-focus lens in which a positive (converging) lens element is placed in front of the diaphragm and a negative (diverging) lens element is placed at the rear of the diaphragm.
Thumbnail
A small version of a photo. Image browsers commonly display thumbnails of photos in arrays of several or even dozens at a time.
TIFF
Tagged Image File Format. An uncompressed image file format that is widely used for its flexibility. Its ability to store data in a lossless format makes it ideal for image archiving and transport.
Time Exposure
An exposure longer than the camera's fixed shutter speeds will allow.
Tint
The color or tone of a print or digital image; sometimes called color cast.
Tone
The apparent brightness of a color in an image.
Tripod
An adjustable three-legged stand used to steady a camera.
TTL Auto Flash
Refers to automatic flash output control through the lens (TTL).
TTL
Refers to through-the-lens metering, in which light levels of a scene are measured by the camera's meter through the lens. Most common in SLR cameras. The term is also often used to indicate a camera's built-in auto flash exposure system.
Tungsten Film
A film balanced for proper color rendition when exposed under tungsten light.
Tungsten Light
Light from a tungsten lamp, with a color temperature of 3200K to 3400K.