fansa84fe8a4
lvl.4
United States
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I use a large cell tower that is about 500 feet away from me as my infinity target to set the focus up with. It might take me a few presses before I get a good one. Te I turn on focus peaking to high and see how it focuses on it with the red infinity lines around it, and redo the calibration if needed.
Then I took an old Air Force 1951 Image Resolution Test Chart ($40 from Edmund Scientific) that photographers used years ago for film and lens testing and set the lens up perpendicular to it, full frame, and checked the edges with the focus scroll wheel. All four edge targets, as well as the center one, should pop into red simultaneously. If they don't, either your lens elements are tilted or the sensor is (More likely scenario with DJI.). You'll see one side more blurry than the other if it isn't aligned right, and lens or camera needs adjustment,
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