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adjust angle aperture barrier filter black-and-white blue Bride brightness close-up collodion color films color temperature cones contrast dark density depth of field distance dive effect electronic flash electronic flash unit emulsion enlarger equipment exposed exposure meters f-stop film speed FLASH PHOTOGRAPHY flashbulbs flat ports fluorescence focal length focus focusing glass gray scale Herb Taylor humidity hypo clearing agent illumination Kodak lamp light litre long-wave ultraviolet materials method metre millilitres nanometres negative normal objects optical ounces paper photogra photographic plate prints processing produce radiation range reflected reflex camera retina sensitivity shadow shutter speed single-lens reflex camera solution spectrum surface technique temperature tion tography tone toner tripod ture twin-lens reflex camera ultraviolet photography underwater photography usually view camera viewfinder Vignetting visible vision visual aspects washing wavelengths wedding wide-angle lenses zone system zoom lens