Sightron Riflescopes - Manual (Page 6)

Target Scopes
Sightron Target Scopes are specially designed for
precision shooting. The parallax adjustment assembly on
all SII Series Target Scopes is based on a very fine thread
with a 720 degree revolution (two complete turns of the
Adjustable Objective Ring). This will allow parallax free
viewing at any distance, by correctly setting the distance
scale ring to the desired setting. The minimum focus dis-
tance is as low as 10 yards o some models. For a better
and precise parallax adjustment we have set up a double
marking system on the distance scale ring, one in white
with the proper white marker for short distances. And the
other in bronze going from 25 yards to infinity.
Note: On SII Series Adjustable Objective models the
white marker is only visible when the objective focus
wheel is turned clockwise to focus on near targets.
Note: SII Big Sky™ and SIII LR Series Side Focus
Models do not have a distance scale and should be
adjusted until the image is clear and parallax free.
(Fig. 7)
Note: SIII Fixed Power Tactical scopes have a rear
focus adjustment located in front of the eyepiece. (Fig. 8)
Note: All SII Big Sky Riflescopes (objective focus mod-
prescription glasses, you must wear them when per-
forming the above procedure. If the reticle is not clear:
SI, SII and SII Big Sky™ Models: Loosen the
locking ring and turn or rotate the eyepiece clockwise
or counter clockwise as needed. When the reticle
appears clear and sharp retighten the locking ring.
(Figure 1)
SIII Models: Simply rotate the fast focus eyebell until
the reticle appears clear and sharp. (Figure 6)
Parallax (Focus) Adjustment
Parallax is the apparent displacement of an object
caused by a change in the position from which it is
viewed. For a riflescope to be parallax free the target
image must be focused onto the reticle. Almost all
Sightron riflescopes are set parallax free at 100 yards.
This means targets that are closer or farther from this
focal point will show a small apparent movement. The
amount of reticle movement is insignificant, and is not
of relative concern when using the scope for hunting or
casual shooting. For other disciplines of this sport, like
competition or precision shooting, the use of a scope
with parallax adjustment is recommended.
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