Great video on your site about the ONAG.
Quote:
Originally Posted by gaston
Let’s use 550nm for the average visible wavelength (classical guiding) and 850nm for the NIR one (for instance ONAG guiding), this leads to an improvement of:
[ (850/550)(6/5) -1] x 100 = 69%
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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?