Aparture- is a hole or an opening through which light travels.
Shutter- is a device that allows light to pass for a determined period of time.
Exposure- is the total amount of light allowed to fall on the photograghic medium (photograghic film or image sensor) during the process of taking a photogragh.
F-stop- an optical system that expresses the diameter of the entrance pupil in terms of the focal length of the lens.
Singal lens reflex- is a camera that typicaly uses a semi-automatic moving mirror system that permits the photogragher to see exactly what will be captured by the film or digital imaging system (after a very small delay), as opposed to pre-SLR cameras where the veiw through the veiwfinder could be significantly different from what was captured on film.
Negitive- Film for 35 mm cameras comes in long narrow strips of chemical-coated plastic or cellulose acetate.
Positive- is a film or paper record of a scene that represents the color and luminances (as near as the medium will allow).
Contact sheet- is a photograghic image produced from film: sometimes a film negative; sometimes a film postitive.
Agitation- The air bubbles that usually occur when dry film is immersed in a solution can be removed without harmful effects in the predevelopment water rinse.
Enlarger- is a specialized transparency projector used to produce photograghic prints from film or glass negitives using the gelitain-silver process, or transparencies.
Stop bath- is a chemical bath usually used in processing traditional black-and-white photograghic films, plates and paper used after the material has finished developing.
Fixer- is a chemical used in the final step in the photograghic processing of film or paper.
Safe light- is a light source suitable for use in a photograghic darkroom.
Burning- increases the exposure to areas of the print that should be darker.
Dodging- decreases the exposure for areas of the print that the photogragher wishes to be lighter.
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