Spiralens screenshot by the author; the scene is an AI-generated illustration made for the app. I am a solo developer, and Spiralens is an Android camera that coaches framing with the golden spiral. I
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Calling calibration a different thing from missing data is the line I would keep. Once the five-second counters come back from the OnePlus, do you expect the future-dated stamps or the unreliable flag to explain most of that 80% invalid rate?
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Proof Over Promises.
Six photos and green for only one of them is a much clearer number than any tracking percentage. Treating a single unreliable gyroscope sample as a reason to wipe the rotation history is an easy assumption to make on one phone, and the new counters every five seconds should settle which of the two causes it was.