Diopter sight
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A diopter sight is an aperture sight component used to assist the aiming of ranged weapons, mainly firearms, airguns, and crossbows. Diopters function to precisely align the shooter's eye with the fro
Target shooting diopter of a 10 metre air rifle with a mounted semi-transparent occluder for the non-aiming eye
Rear, rotating diopter drum sight of a SIG SG 550 service rifle. The viewing aperture above the "3" (denoting the 300 m setting) can be seen.
Civilian AR-15 target sights have an aperture between 1 and 1.15 mm (0.039 and 0.045 in). The aperture on AR-15 military sights have a day aperture of approximately 1.78 mm (0.070 in), and the M16A2 also a night setting with a larger 5.08 mm (0.200 in), and as such the military sight is not strictly a diopter sight in either setting.
The concentric circle alignment principle is used for precise aiming at round targets
SIG Sauer 200 STR
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The SIG Sauer 200 STR, also known as the SIG Sauer 200 STR Match, is a bolt-action rifle mostly used as a target/competition rifle for national competitions by Norwegian, Swedish and Danish sport shoo
Espen Berg-Knutsen at Landsskytterstevnet in 2007 with a left handed Sauer 200 STR featuring a mirage band