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photojournalism
photokinesis
photolithography
photoluminescence
photolysis
photomap
photomask
photomechanical
photometry
photomicrograph
photomontage
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photomultiplier
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photographic magnitude

pho·to·graph·ic mag·ni·tude (plural pho·to·graph·ic mag·ni·tudes)


noun 
Definition:
 
brightness of star measured photographically: the magnitude of a star determined by measuring its size on a photographic plate. Depending on the color of the star, photographic magnitude and visual magnitude can differ because the eye and standard photographic plates have different color sensitivities.

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