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Americas, Special Report, News [复制链接]

Depending on the distance of the subject from the camera, the lens has to be a certain distance from the film to form a clear image. In most modern cameras, autofocus is one of a suite of automatic features that work together to make picture-taking as easy as possible. Some cameras may have a combination of both types, depending on the price of the camera. In general, less expensive point-and-shoot cameras use an active system, while more expensive SLR (single-lens reflex) cameras with interchangeable lenses use the passive system. Looking for a Tripod to Steady your Images? Read Tripod Reviews and compare prices at Consumer Guide Products before you buy. The Polaroid camera used an ultra-high-frequency sound emitter. Then listened for the echo (see How Radar Works for details). The Polaroid Spectra and later SX-70 models computed the amount of time it took for the reflected ultrasonic sound wave to reach the camera and then adjusted the lens position accordingly.  




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