Rifle Scopes DefinitionsThis is a featured page

Objective - The objective is the target side lens of the rifle scope. The size of the objective is always discussed as diameter in millimeters.

Ocular - The Ocular lens is the eye-side lens of a rifle scope.

Eye Relief - Eye releif is the focal distance from the ocular lens to the eye.

Exit Pupil - Exit pupil is the amount of light that enters the eye from the scope. The greater the exit pupil, the brighter the image. The exit pupil is determined by dividing the objective lens diameter by the magnification.

Field of View - Field of view is the size of image available at a given distance. The field of view is generally controlled by the size of the objective and level of magnification.

Coatings - coatings are thin layers of substance placed on the lenses to enhance performance. Coatings can be used for anti-glare, moisture and fogging control, light filtering, and anti reflectiveness.

Adjustable Objective - An adjustable objective (AO) scope allows you to adjust the focal distance of the rifle scope. AO scopes are typically used for low power -close in shooting such as pellet rifles and varmint hunting.

Reticle - The reticle is the image superimposed on the object being viewed. The standard reticle is crosshairs. Other common rifle scope reticles are Duplex, Mil Dot, Dot, and Boone and Crockett. Reticles can also be illuminated.

Turret - Turrets are the adjustment knobs midway on the rifle scopes. Turrets are used to zero the rifle socpe on target and also set the windage and elevation adjustments when shooting.

Elevation - Elevation is the vertical adjustment on rifle scopes. Elevation adjustments are used for zeroing a rifle scope on target and compensating for bullet drop when shooting at distance.

Windage - Windage is the horizontal adjustment on rifle scopes. Windage adjustments are used for zeroing a rifle scope on target and compensaging for cross winds when shooting at distance.

Hold over - Hold over is holding the center of the reticle over a target to compensate for bullet drop when shooting at distance. Hold over is used when time doesn't allow for using the elevation turret.

Lens shade - Lens shades are attached to the objective side of the scope to shield the objective from glare from the sun or moisture. Lens shades are typically standard in that any 40 mm lens shade should fit any 40 mm scope. There are some exceptions and you should verify compatibility prior to purchasing a lens shade.

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Latest page update: made by quickdraw62 , Nov 6 2009, 5:38 AM EST (about this update About This Update quickdraw62 Edited by quickdraw62

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