Sightron Riflescopes - Manual (Page 13)

Parallax - Parallax is the effect of lack of proper adjustment
between the image and the reticle. For a riflescope to be paral-
lax free the target image must be focused onto the reticle.
Almost all riflescopes are pre-set parallax free at 100 yards.
This means, targets that are closer or farther from this focal
point, the scope reticle will show an apparent movement.
However, the amount of reticle movement is insignificant,
and is not of concern when using the scope for hunting or
casual shooting. For other disciplines of this sport, like com-
petition or precision shooting, the use of a scope with parallax
adjustment is recommended. This will allow anyone to be
parallax free at any distance, by correctly setting the focus
adjustment ring to the desired range on the scale ring.
Reticle Selector Knob - The knob on the left side of an
Electronic Sighting Device that changes the reticle pattern.
Rheostat Switch - The switch found on Electronic Sighting
Devices and illuminated reticle scopes that house the battery.
This switch also controls the light intensity and is adjustable.
Side Focus Knob - An adjustable knob usually found on
theleft side of the scope that changes the focus of the image as
viewed through the riflescope.
Variable Power Ring - The ring in the back of the scope
that changes the magnification.
Windage Knob - The adjustment knob on the right side
that adjusts the bullet impact left and right in the horizontal
plane when mounted in the traditional manner (elevation
knob on top and windage knob on the right side as seen from
the shooting position). Glossary
Adjustable Objective - An Objective lens that is adjustable
for focus at varying distances. Sightron Adjustable Objectives
can focus as low as 30 feet in infinity depending on the indi-
vidual model.
Elevation Knob - The adjustment knob on top that adjusts
the bullet impact up and down in the vertical plane when
mounted in the traditional manner (elevation knob on top
and windage knob on the right side as seen from the shooting
position).
Eye-Relief - The distance from the rear of the objective lens
to the eye as measured with a full field of view in the rifle-
scope.
Fast Focus Eyebell - A type of eyebell focus that allows the
ocular lens assembly to rotate independent of the eyebell
assembly. This feature allows for quicker reticle sighting
adjustments.
Objective Lens - The front lens of a Riflescope, usually the
larger of the two outermost lenses of the Riflescope. The
object lens is a critical factor in determining resolution and
light transmission characteristics.
Ocular Lock Ring - The Lock ring on the rear of the scope
that tightens against the Ocular Lens Assembly to prevent
movement.
Ocular Lens Assembly - The lens group at the rear of the
scope that allows your eye to focus on the reticle.
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