BSA Optics CAT416X44SP - Manual (Page 6)

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6.) PARALLAX CORRECTION
Parallax is a condition that occurs when the image of the target is not focused
precisely by misalignment of shooters eye on the reticle plane. This condition
exists in all scopes and accounts for more enlarging of rifle group sizes than
anything else. Parallax is visible as an apparent movement between the
crosshairs and the target when a shooter moves their head and changes eye
alignment in the scope. The higher the magnification the more visible this is.
The side parallax knob is located opposite the windage knob on the other
side of the scope for models with adjustable parallax. (On models with
Illumination the rheostat battery knob will be located in this position and the
parallax will be fixed at 100 yards).
Without touching the rifle, move your eye around behind the scope. Do the
crosshairs appear to move on the target? If they do, the parallax is not set for
the range of the target you are using. Catseye™ rifle scopes equipped with an
adjustable parallax knob can correct this at all yardages.
If your crosshairs move to the right on the target’s image when you move your
head to the left, the image plane must be further away than the crosshairs. To
pull the image plane in by screwing the objective bell in so that the objective
moves closer to you. In this set up, the image is essentially tied to the
objective so moving the objective 0.1 mm moves the image 0.1 mm. Adjust
outward to pull back.
7.) MAINTENANCE
DO NOT ATTEMPT TO DISASSEMBLE OR CLEAN THE SCOPE INTERNALLY.
IF THE SCOPE REQUIRES REPAIRS OR ADJUSTMENT, SEE WARRANTY
CARD FOR INSTRUCTIONS.
Start by brushing away dust and dirt particles from the lenses of the scope.
Using the included lens cloth designed to clean optical surfaces brush dust or
dirt particles away from the center of the lens towards the outside edges.
To remove minor smudges or fingerprints, start in the middle of the lens and
using a circular motion clean towards the outside edges of the lens. If more
aggressive cleaning is needed Put a few drops of liquid lens cleaner on the
cloth.
Store the rifle scope in a moisture-free environment.
(Note: Not all cloth material like a handkerchief will remove smudges or
fingerprints. Round fibers found in many cloth materials will tend to spread
smudges and fingerprints. Use cleaning tools specifically designed for rifle
scope cleaning).