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Onag
Interesting.
Do you use a cold mirror as well, same concept than the ONAG?
Tis confirms my experience, a distorted guide star does not impact the ability of the tracking software, as long as the deformation remains constant over time and position.
To avoid multi reflections and possible ghost images on the imager side the BS most have wide band high quality multi layer coatings, including an AR coating on its back.
Imaging through any type of window with that amount of tilt (45 degrees) will compromise the picture quality (distortions and chromatic aberrations). This is why AO units, such SBIG AO8, AOL, are limited to few degrees of tilt/tip minimizing such effects.
Reflecting the light to the imager is a much better solution, today's high quality BS are almost perfect, so do star diagonals.
What is the cut-off wavelength of your BS?
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