Quote:
Originally Posted by multiweb
Is there any point guiding at 850nm vs. 750nm taking into account the sensitivity of the guider as well? Also would you rather use a cut off filter rather than a NB filter or it doesn't matter?
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The energy output of an M-Class star peaks between 750nm and 850nm, but remains high right past the sensitivity of mainstream guiding cameras. The further into the near-infrared, the better the seeing conditions and this is why a cut-off filter is preferable over a narrow-band filter, so that you can take advantage of whatever near-infrared light is being emitted by the star and whatever sensitivity the camera has to offer at that end of the spectrum, however small.