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angle Ansel Adams appear architecture artificial light average axis light background blue filter blue light blue sky Book brightness range brilliant camera clouds color photography color temperature contrast dark daylight density diffuse diffuse reflections direct distance Edward Weston emulsion environment example exposure factor exposure scale exposure units exposure value fall on Zone film speeds flashlamp foliage gray gray card green filter guide number Half Dome haze high values highlights illumination impression intensity interpretation K2 filter landscape lens light source meter reading mood moon natural light negative normal objects opacity open sky orthochromatic film panchromatic film photograph placed on Zone placement polarizer problem red filter reduced reflected light reflectors rendered rocks scene sensitive sensitometry shade shadow areas shadow values sky value skylight snow substance sunlight sunlit areas surface texture tonal tone tree tungsten visual window Wratten Wratten filters yellow Yosemite Zone VIII