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Yes most digital camera's are sensitive to IR light, to prove this to yourself, grab a point-n-shoot or DSLR(with liveview on) then aim a TV remote at the camera and press a button.
You will see the remote's infrared LED flashing on the camera screen.
IR LEDs operate at around 780nm so the camera's infrared blocking filter is cutting that quite a lot, but enough gets thru for the cam to detect it. Most astro cams as far as I am aware don't have an IR cut filter.
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