Professional photography

Professional photography

Professional photography is the occupation of taking pictures and selling them freelance or as part of a contract usually with a publication.

Industry: Photography

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Professional photography

Joule

Photography; Professional photography

Unit used to quantify the light output of electronic flash. A joule is equal to one watt second of 40 lumen-seconds. The measure is used to compare flash units in terms of power output.

Tungsten halogen lamp

Photography; Professional photography

Improved version of the normal tungsten lamp. It is much smaller and more consistent in colour temperature as the glass envelope used is non-blackening.

Aspherical lens

Photography; Professional photography

Lens with a curved, non-spherical surface. Used to reduce aberrations and enable a more compact lens size.

Depth of focus

Photography; Professional photography

Distance which the film plane can be moved while maintaining an acceptably sharp image without refocusing the lens.

Obsolete printing process designed to give the impression of a painting on ivory. A hand coloured print was impregnated with wax and squeegeed face down on hot glass. The paper base was then back by ...