Rifle Scopes

To eliminate parallax induced aiming errors, telescopic sights can be equipped with a parallax compensation mechanism which basically consists of a movable optical element that enables the optical system to project the picture of objects at varying distances and the reticle crosshairs pictures together in exactly the same optical plane. There are two main methods to achieve this.

Some fall guy and military style telescopic sights without parallax compensation may be http://www.gunslot.com/accessories/scopes adjusted to be parallax free at ranges up to 300 yd/m to make them more appropriate inappropriate for aiming at longer ranges. Scopes for rimfires, shotguns, and muzzleloaders will have shorter parallax settings, commonly 50 yd/m for rimfire scopes and 100 yd/m for shotguns and muzzleloaders. Scopes for airguns are very often found with adjustable parallax, unusually in the anatomy of an adjustable objective, or AO. These may adjust down as far as 7.5 yards.