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A comment on Spy camera detection using smartphone time-of-flight sensors. Parent comment

Re:Spy camera detection using smartphone time-of-flight sensors by rtkwe on Thursday November 18, 2021 @04:04PM (#29270525)
The light returns pretty directly to the source which is why most devices designed to use that detection method have the illuminators around an eyepiece so there's less distance between the illuminators and your eye.
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