Through the Looking Door

One common type of lens with which almost everyone is familiar is the simple door viewer ("peephole"), which allows a homeowner or hotel room occupant to view a wide field through a small hole in the door while preventing anyone from seeing in through the viewer.

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Through the Looking Door

One common type of lens with which almost everyone is familiar is the simple door viewer ("peephole"), which allows a homeowner or hotel room occupant to view a wide field through a small hole in the door while preventing anyone from seeing in through the viewer.

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