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The so-called "single lens" means that the photographic exposure light path and the scene light path share a single lens, unlike a paraxial camera or a double reflection camera with an independent lens. "reflection" means that a plane mirror in the camera separates the two light paths: the mirror falls while taking the scene, reflecting the light from the lens to the pentaprism, and then to the viewfinder window; when shooting, the mirror is lifted quickly, and the light can shine on the film or the photosensitive element...

 

 

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