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AMATEUR MOVIE MAKING 441
Formaldehyde — A chemical used for hardening the emulsion when softened by heat.
Foreground — That part of a picture which represents the objects nearest the camera.
Formula 1 — A recipe for compounding a solution.
2 — A mathematical equation in which letters represent values to be assigned according to the problem which is to be solved.
F. System — The method of calibrating lens diaphragms in terms of the focal length.
Frilling — Separation of the emulsion from its support at the edges.
Fringe — The colored outline of an image produced by an uncorrected lens.
Geneva Movement — An intermittent movement produced by a cam and star wheel. The movement used in most projection machines.
Ghost 1 — A ghostly apparition in pictures produced by double exposure.
2 — Blurring produced in pictures where the shutter does not operate in correct synchronism with the moving film.
Goerz — Name of a maker of Cine lenses, camera attachments and motion picture film.
Goerz Devices — A number of amateur motion picture camera accessories made by C. P. Goerz, such as the sliding base, reflecting focussing device, outside iris, focussing microscope, mask box, color filters, lens extension, lenses, etc.
Goerz-Tenax Meter — A distance meter made by Zeiss-Ikon. Small and compact but unusually accurate.
Gradation — The scale of tonal values in a picture.
Graduate — A measuring vessel for fluids.
Graduated Filter — A color filter dark yellow at one end and clear glass at the other, used for correcting skies while leaving foreground uncorrected.
Granularity — Coarseness in the silver grains in a photographic image.
Grease Paint — The sticks of color used by actors to prepare their faces for screen photography.
Halation — The ghostly halo sometimes seen about the image of a bright object in a photo.