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19th Century absorbed angle aperture ASA rating black-and-white film blue Brady cadmium sulfide calotype camera chemicals clouds coating collodion color create Daguerre daguerreotype dark darkroom detail developed Eastman electronic flash emulsion energy equipment exposed fast film Fenton filter fisheye lens flash units floodlight graininess gray Groskinsky highlights Holtzer illumination incident-light meter infrared Jackson lens light meter light reflected light waves light-sensitive look medium-speed near-red negative Niepce paper paper negative particles photogra photographer placed Polaroid Land film portrait positive Primoli printing produce range reading record reflected-light meter reflector ROGER FENTON scene sensitive sensitivity speck shaded shadows shutter speed side silver bromide silver bromide crystals silver iodide silver nitrate Snyder spot meter surface take pictures Talbot texture Time-Life tintype tographers tonal tones ture underexposed view camera visible wavelengths wet plates zones