![]() ![]() A long sighting line helps to reduce eventual angle errors and will, in case the sight has an incremental adjustment mechanism, adjust in smaller increments when compared to a further identical shorter sighting line.Ĭivilian AR-15 target sights have an aperture between 1 to 1.15 mm (0.039 to 0.045 in). The diopter sight is easy to use and usually allows for very accurate aiming, because a relative long sighting line can be used. ![]() The small diopter viewing opening ensures the shooter's eye is very precisely and consistently centered behind the diopter sight. The typical occluder used in target shooting diopters is a disc of about 25 mm (0.98 in) in diameter with a small hole in the middle. Through this small hole the shooter can view the front sight component(s) and the intended target. The diopter is in principle a vertically and horizontally (elevation and windage) adjustable occluder with a small hole (aperture), and is placed close in front of the shooter's aiming eye. The viewing aperture above the "3" (denoting the 300 m setting) can be seen. Rear, rotating diopter drum sight of a SIG SG 550 service rifle. ![]()
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