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aberration amateur angle aperture background bromide bulb centre coated colour temperature contact printing contrast copying density depth of field distance edge effect electronic emulsion enlarger equipment etching exposed exposure field filament filter flash focal length focal plane shutter focus focusing focusing screen frame front gelatin give glass grain graphic illumination lamp layer lenses light source London magazine mask ment metal meter method miniature camera mirror mount movement moving normal normal lens object optical panchromatic paper photographic picture plane plate portrait position possible potassium produced projection projector range rangefinder rays record reflected reflector reproduction retouching safelight scale screen sensitive material sensitometry separation negatives shadow sheet shutter speed side silver bromide silver chloride silver halide slide sodium solution strips studio suitable surface tape technique telephoto lens temperature tion tone transparency tungsten usually