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absorb absorption angle aperture beam biol blue camera lens camera tube Chapter colour film colour temperature contact printing contrast curve dark darkroom Daylight density depth of field diameter diffuse dioptre discharge distance effect electronic flash emulsion enlarger equipment exposed exposure Figure filter flash bulbs fluorescence focal length focus focusing give glass grain Ilford illumination increase infra-red radiation infra-red record Infrared Photography Kodak lamp latent image layer lenses light source lines luminescence luminous luminous flux magnification material measured method negative normal object optical panchromatic paper Photogr Photogrammetry photographic photomacrography picture plane polarized processing produce range rays reflection reflector refractive index reproduced reversal films screen Section IV f sensitive shutter silver bromide silver halide solution specimen spectral spectrum speed suitable supplementary lens surface technique television transmission transmitted tungsten ultraviolet usually Vidicon visible voltage wavelength yellow