Parallax is a term used to describe the apparent difference in position between an object viewed from different viewpoints. In the case of a rifle scope, this occurs due to the difference in distance between the sighting mechanism and the rifle's bore. Parallax will reduce your accuracy, as the crosshairs in your scope will change position when you change your viewpoint. Modern air rifle scopes will have an adjustable objective knob that will allow you to correct parallax.
- Skill level:
- Moderately Easy
Things you need
- An air rifle with scope
- A tape measure
- A stable rest for the rifle
- An object to use as a target
Place the air rifle on a solid rest such that it will stay steady even if you're not holding it.
Use a tape measure to place a target at a known distance.
Set the adjustable objective knob on your scope to the distance from the rifle to the target.
Move your head left and right about 1 inch to the left and right of the scope.
If the crosshairs remain centred on the bull's-eye, your scope has been properly configured. If the crosshairs move around, try altering the adjustable objective knob until the crosshairs stabilise.
Tips and warnings
- If you are unable to eliminate the parallax by adjusting the adjustable objective settings, your scope is defective and will need to be replaced.
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