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Hi,
the whole thing with the heater should only prove, that a remarkable amount of radiation beyond the red end of the visible spectrum is passing the filter. This was of course not at all a measurement, only a test with a continous spectrum in contrary of the narrow one of an LED.
Imho, the sensitivity of cmos fotodiodes at wavelengths over 1100-1200 nm
should be very small, so the middle and far IR shouldn't be of much relevance.
After all, the filter does a good job in the modified cam ( I made m27 and ngc 6992 this morning, poor seeing, but the Ha regions are much brighter then before.
Regards
Rudi
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