29-11-2009, 10:18 PM
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Highest Observatory in Oz
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Join Date: May 2006
Location: Canberra
Posts: 17,681
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Quote:
Originally Posted by AlexN
Mike - That halo is common place for a QHY8.. I got that using the QHY8 with newtonians, no glass in the optical path apart from the QHY8's filter window.. I got it with all the scopes I used the QHY8 in, and it mysteriously disappeared in the C11 when I changed from the QHY8 to the SBIG... I saw similar reflections in the Orion SS Pro, but smaller because the optical window on the Orion camera is smaller. This makes me wonder if the Microlens on the Sony sensors is somewhat reflective, and bounces light back onto the filter window, or if the glass used in these budget cameras optical window is perhaps not coated as well as other cameras...
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Fair enough
Mike
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