My primary focus is “down range” mirage caused by heat rising from the ground which can be an issue on hot days, or even when it gets a bit cooler and the sun comes out. With a variable power rig, a lower magnification setting can often be set to a point the mirage is not a factor, but with single power, high magnification ... things can look a little wiggly.
I have also been told that adjusting parallax just a bit out-of-focus can help but have never tried that?
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