Explaining red dot parallax is a confusing topic even regarding rifle applications. Discussing pistol dot parallax shift is even worse—marketing fluff, conflicting specifications, and random “experts” in internet forums make it a wasteland of misinformation. Swampfox is here to help clear it up in the best way—by putting live rounds down range on camera.
Parallax shift is a change in bullet point of impact on target depending on your eye’s alignment with the sight and therefore the dot’s apparent position inside the window. If you move your eye around behind the red dot without moving the gun at all, the dot will change position inside the optic’s window, but the dot’s position on the target should not change. If the dot’s position relative to the target changes depending on where the dot appears in the window, you have a parallax shift problem. You will hit the target in a different place each time you shoot with the dot in a different part of the window.
No collimated light optic (red dot or reflex sight) is parallax free at all distances. Most manufacturers including Swampfox claim their dots are parallax free at 33 yards, so what’s the worst case scenario, and how much does it matter? What is the shift in point of aim vs. point of impact at 15 yards if we deliberately place the dot all around the edges of the optic window instead of shooting with the dot centered? There’s only one way to find out—shoot it and show the real results.
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