FS 161 Lecture Notes - Lecture 7: Normal Lens, Telephoto Lens, F-Number

• School: SJSU
• Department: Justice Studies Department
• Course: FS 161
• Professor: Mary Juno

Document Summary

Fs 161 lecture 7 concepts of photography for csis and forensic analysts: basic equipment, camera, normal lens, used most often, close-up and wide-angle lenses, rarely used, als, tripod, batteries, ruler, owner"s manuals for camera and flash. Parts of a camera: shutter: controls amount of time light strikes sensor, aperture: amount of light. Aperture opening (f-stop: opening inside lens that can be adjusted, controls amount of light that strikes film, expressed in f-stops, either full or half stops, largest number smallest aperture, smallest number largest aperture. Exposure and reciprocity: inverse relationship between intensity and duration of light, determines reaction of light-sensitive material, film response determined by total exposure, total exposure = (intensity)(time) High speed films: low light photography, surveillance, faster shutter speeds, sports, surveillance, extends flash output, greater depth of field. Depth of field/depth of focus: high aperture, lower the depth of field, lower aperture, greater the depth of field.