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iPhone 4 half-blind to IR
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iPhone 4 half-blind to IR

by bitbangerbob on Fri Sep 24, 2010 8:40 pm

:shock: While most digital cameras (phones, webcams, camcorders, etc) are great for trouble-shooting infrared LEDs, it seems the rear-facing camera on the iPhone 4 filters out nearly all of the IR, at least at the 938 nm, or so, wavelength of most IR LEDs. The front-facing camera, like most cameras, does show lit IR LEDs as bright violet/white. So, if you're used to using your iPhone to see if that IR LED is really lit, be sure to use the right camera.

Now, where can I get back that hour of confused trouble-shooting?

Bob Reynolds
Electronics Guy
omsi.edu

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Re: iPhone 4 half-blind to IR

by Hfuy on Fri Sep 24, 2010 9:26 pm

Far be it from me to point out that most photographic devices are supposed to be insensitive in the IR...
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Re: iPhone 4 half-blind to IR

by Snipeye on Fri Sep 24, 2010 10:38 pm

There's probably a filter on one of the cameras, but perhaps there wasn't enough space for the other - either way, a helpful tip. Thanks, bitbangerbob!
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Please be positive and constructive with your questions and comments.