Glossary

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Tacking iron:  A small, electrically heated tool used to melt the adhesive in dry-mount tissue, attaching it partially to the back of the print and to the mounting surface.  This keeps the print in place during the mounting procedure.

Tank:  A container for developer or other processing chemicals into which film is placed for development.

Telephoto effect A change in perspective caused by using a long focal length lens very far from all parts of a scene.  Objects appear closer together than they really are.

Telephoto lens:  Loosely, any lens of very long focal length.  Specifically, one constructed so that its effective focal length is longer than its actual size.  See also long lens.

Tenting:  A way to light a highly reflective object.  The object is surrounded with large sheets of paper or translucent material lighted so that the object reflects them and not the lamps, camera, and other items in the studio.

Thin Describes a negative or an area of a negative where relatively little silver has been deposited.  A thin negative transmits a large amount of light.  Opposite:  dense.

Time:  A shutter setting marked T at which the shutter remains open until reclosed by the photographer. 

Tintype:  A collodion wet-plate process in which the emulsion was coated onto a dark metal plate.  It produced a positive image.

TLR:  See twin-lens reflex.

Tone:  1.) To change the color of a print by immersing it in a chemical solution.  2.) The lightness or darkness of a particular area.  A highlight is a light tone; a shadow is a dark tone.

Transparency An image on a transparent base, such as film or glass, that is viewed by transmitted light.  See slide (1).

Tripod A three-legged support for a camera.  Usually the height is adjustable and the top or head is movable.

Tungsten film:  Color film balanced to produce accurate color renditions when the light source that illuminates the scene has a color temperature of about 3200K, as do many tungsten lamps.  Sometimes called Type B film.  See also Type A film.

Tv:  Abbreviation of time value.  Used on some camera information displays as a shortened way to refer to shutter speed settings.

Twin-lens reflex:  A camera in which tow lenses are mounted above one another.  The bottom (taking) lens forms an image on the exposed film.  The top (viewing) lens forms and image that reflects upward onto a ground-glass viewing screen.  Abbreviated TLR.

Type A film:  Color film balanced to produce accurate color renditions when the light source that illuminates the scene has a color temperature of about 3400K, as does a photoflood.  See also tungsten film.

Type B film:  See tungsten film.

 

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