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parallax
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. Due to foreshortening, nearby objects show a larger parallax than farther objects when observed from different positions, so parallax can be used to determine distances.
To measure large distances, such as the distance of a planet or a star from Earth, astronomers use the principle of parallax. Here, the term parallax is the semi-angle of inclination between two sight-lines to the star, as observed when Earth is on opposite sides of the Sun in its orbit. These distances form the lowest rung of what is called "the cosmic distance ladder", the first in a succession of methods by which astronomers determine the distances to celestial objects, serving as a basis for other distance measurements in astronomy forming the higher rungs of the ladder.
Parallax also affects optical instruments such as rifle scopes, binoculars, microscopes, and twin-lens reflex cameras that view objects from slightly different angles. Many animals, along with humans, have two eyes with overlapping visual fields that use parallax to gain depth perception; this process is known as stereopsis. In computer vision the effect is used for computer stereo vision, and there is a device called a parallax rangefinder that uses it to find range, and in some variations also altitude to a target.
A simple everyday example of parallax can be seen in the dashboards of motor vehicles that use a needle-style mechanical speedometer. When viewed from directly in front, the speed may show exactly 60, but when viewed from the passenger seat, the needle may appear to show a slightly different speed due to the angle of viewing combined with displacement of the needle from the plane of the numerical dial.
Sold the rifle minus the scope :)
VXII 4x that I had Leupold adjust the parallax to 75 yards back when they did things like that. Was mounted with Leupold Rifleman rings and there are no ring marks. Leupold Alumina flip covers on the front lens.
Here is the scope on the rifle that I sold
Looking at 2-10 scopes for my 16” AR-15. Considering the 2-10x36 Trijicon Credo as it has a lot of features I like, the reticle, glass clarity, weight, and price. It does not have a parallax adjustment though. Is it needed for shots out to 600 meters.
For your consideration is a like-new Parallax Pistol Sighting Rest from Hyskore. All metal frame, cushioned clamps to hold the grips, padded butt rest (my range needs one of those), adjustable height padded rest, adjustable length from grip to barrel rest, adjustable front legs. Man is this...
As the description states I have a Leupold VX-5HD 3-15x44 CDS-ZL2 - 30mm - Side Focus - Wind-Plex scope for sale.
This scope retails for $1000 + tax & shipping, so looking to get close to that back so I have listed at $850
I own another of these scopes that I have mounted on a 30-06 hunting...