Telescopic sight mounted on a rifle.
Telescopic Sight - An optical sight, offering some magnification, often variable, with some kind of adjustable aiming grid inside (a reticle), which when mounted on a firearm, usually a rifle, makes sighting easier. Using iron sights, as one ages, presbyopia (the deterioration of nearfield focusing ability) makes it difficult to focus simultaneously on the three planes of rear sight, front sight, and target. It is easier to aim a rifle with a telescopic sight because one may simply place the reticle on the target.
Telescopic sights are designated first by their power, and then by the diameter of their objective lens. 4x20 would mean 4 times magnification and with a 20mm objective lens. 3-12x50 would mean a variable scope, adjustable between 3 and 12 times magnification and with a 50mm objective lens for better light gathering.
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