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A sight or sighting device is any device used to assist in precise visual alignment (i.e. aiming) of weapons, surveying instruments, aircraft equipment, [1] [2] optical illumination equipment or larger optical instruments with the intended target. Sights can be a simple set or system of physical markers that serve as visual references for ...
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Tinted transparent plastic insert elements may also be used, with a hole in the middle; these work the same way as an opaque ring, but provide a less obstructed view of the target. High-end target front sight tunnels normally also accept accessories like adjustable aperture and optical systems to ensure optimal sighting conditions for match ...
If a target of a known diameter of 16 inches fills just half of the total post-to-post distance (i.e. filling from sight center to post), then the distance to target is approximately 200 yards (180 m). With a target of a diameter of 16 inches that fills the entire sight picture from post to post, the range is approximately 100 yards.
An adjustable diopter aperture and optical filter system as used by Olympic 10 metre air rifle contestant Hattie Johnson. Taking aim through a diopter and globe sighting line. Competitor taking aim through a diopter and globe sighting line on a Feinwerkbau P700 PCP target air rifle at the 2014 Warrior Games .
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related to: target adjustable picture hanging systemInexpensive...required less than a half-hour to install - nytimes.com