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UNDERSTANDING PARALLAX
Parallax is the apparent movement of the target relative to the
reticle when you move your eye away from the center point of the
eyepiece. It occurs when the image of the target does not fall on the
same optical plane as the reticle. This can cause a small shift in the
point of aim.
Maximum parallax occurs when your eye is at the very edge of the
exit pupil. (Even in this unlikely event, our 4x hunting scope focused
for 150 yards has a maximum error of only 8/10ths of an inch at
500 yards.)
At short distances, the parallax effect does not affect accuracy.
(Using the same 4x scope at 100 yards, the maximum error is less
than 2/10ths of an inch.) It is also good to remember that, as long as
you are sighting straight through the middle of the scope, or close to
it, parallax will have virtually no effect on
accuracy in a hunting situation.
ABOUT FIXED PARALLAX DISTANCE SCOPES
Any fixed focus optical system can be adjusted to be parallax free at
only one distance. Most Leupold scopes are adjusted at the factory to
be parallax free at 150 yards. However, there are exceptions:
1. Leupold rimfire scopes are set to be parallax free at 60 yards.
2. Leupold shotgun/muzzleloader scopes are set to be parallax free
at 75 yards.