From Newsgroup: rec.food.cooking
On Wed, 03 Dec 2025 19:23:50 GMT
dsi1 <
user4746@newsgrouper.org.invalid> wrote:
CCTV <WatchingYou@cctv.surveillance.com> posted:
Movie theater cctv cameras use infra-red light.
Human eyes can't detect light in the infrared spectrum but cell phone
image sensors have no problem detecting IR light. I use a cell phone
to see if a IR emitter/diode is functioning. It's a very useful hack.
The same thing has made time exposure shots of the Auroral displays in
southern states common now, as opposed to naked eye displays like the
Canajuns get.
https://www.youtube.com/watch?v=-9Gx2MU6cmI
May 11, 2024
The aurora borealis, also known as the northern lights, was visible
above the islands early Saturday morning, for the first time in over a
century.
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