Nikon Monarch X 4-16x50 SF - Manual (Page 6)

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Note:
The windage and elevation scales of the riflescope 2.5-10x44 SF and 4-16x50 SF are calibrated in division of 1/4 minute of angle with a click at intervals of 1/4 minute of angle
(one division).
When adjusting the reticle to the point of aim, remember that one minute of angle equals approximately one inch (2.54 cm) at 100 yards (91.44 m). Therefore, if the impact point is
two inches (5.08 cm) low and one inch (2.54 cm) right at 100 yds (91.44 m) Parallax Setting, you should adjust two minutes of angle up one minute of angle left. In case of 50 yds
(45.72 m). Parallax Setting the adjusting value is double. In case of 75 yds (65.58 m) Parallax Setting is 1.5 times.
(5) Adjustable objective
(3) The riflescope, 2.5-10x44 SF and 4-16x50 SF can be more precisely focused within the range of at least 50 yds (45.72 m)~infinity by rotating the Side Focus adjustment ring.
(3) Parallax can be eliminated and sight alignment will be accurate.
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Maintenance
(1) Lens cleaning
(1) To remove dirt of fingerprint, soak gauze of lens cleaning paper (silicon-free paper sold at camera shop) with a small quantity of absolute alcohol (available from drugstore) and
lightly wipe off. Wiping with handkerchief of leather is not recommended as it is likely to damage the lens surface.
(1) Dust may scratch the lens surface or corrode the lens.
(1) Brush dust off using a soft oil-free brush.
(2) Scope Exterior
(1) Use a soft dry cloth to wipe off any dirt or finger-prints that might accumulate.
(1) It is not necessary to oil the scope's surface.
(3) Windage/Elevation Adjustments
(1) These adjustments are permanently lubricated. Do not attempt to lubricate them. Cover with caps supplied. except when adjusting, to keep out dust and dirt.
(4) Eyepiece Ajustment
(1) This adjustment is permanently lubricated. Do not attempt to lubricate.
(5) Power Selector Ring
(1) No lubrication is required on the power selector ring.
(1) Do not loosen or remove screws in power selector ring.