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Sight is divided into mechanical sight and optical sight, aimed at the mirror, or called optical aiming device (optical sight), its origin has been difficult to textual research. It is said that at least in Europe in the 16th century, it has been attempted in the gun stock at a fixed lens. With written records, in the 19th century ago, firearms has a telephoto lens type aiming device, and can be used for low light conditions in the aim.
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