Diagnosing parallax–a lesson from Lucid Optics
I’ve been fortunate to attend the Blue August gun writers’ conference this week. In the process of learning about new products industry reps were there to promote, I also learned a few things about shooting. This one will be of interest to anyone who uses a magnifying scope. It was shared by Jason Wilson, founder and CEO of Lucid Optics, based in Riverton, Wyoming.
The correct definition of parallax involves more science than I can digest in a year. So here’s the Parallax for Dummies version: when viewing a target through multiple lenses, its real location may be different, by a few inches or even more, as compared to how it’s perceived by your eye.

Long range accuracy requires resolution of parallax. The rifle Savage’s BA Stealth in 6.5 Creedmoor, fitted with a Bushnell tactical scope.
Our eyes are incredible tools, and so are good quality scopes. But this bit of inaccuracy could result in a miss or an inhumane kill, so it must be addressed by the long range shooter.

Fine-tuning your scope to your own vision is necessary to achieve a humane kill. Photo by Lucid Optics
Make sure the rifle is supported on a bipod or other object and is stable. Pick a stationary target at midrange distance, about 300 yards. Make sure the picture is clear and in focus as you center the reticle on it. Now, keeping the rifle and scope perfectly still, move your head, keeping focus on the target. See how the target appears to move around? Repeat this head movement exercise, taking note of whether the reticle stays on the target and appears to move with it, or whether it remains in the center as the target “moves” around.

Shooting with the magnification of my L7 scope at a recent event. Photo by Kirk Wheeler
Wilson said that many people make the mistake of assuming the left-hand adjustment knob on their riflescope (if one exists) is a fine focusing knob. It’s actually there for parallax adjustment. If your scope has a parallax adjustment knob, repeat the parallax test as you continue turning it until the target and reticle images “float” as one.

Parallax is less likely to occur at short distances. Pictured is a recent test of Huber Concepts’ trigger and muzzle brake.

Lucid L5 scope pic is by Lucid Optics
Now that is a great tip.
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Thank you for clearing the issue up for me. You explained it in plain English as well 👍