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Peter, The halo around Alnitak is standard fare for a QHY8's front filter. I've never heard of someone imaging the horse head with a QHY8 and not getting that reflection.. It will happen on other stars to lesser extents, M45 is a good example... As Doug said, ditching the standard optical window from the QHY8 and using a Baader filter will resolve that issue..
The light rays coming through the image are caused by Alnilam, The next bright star up from Alnitak in Orion... It will have been within the field of view of the telescope, but not on the camera sensor. Thats whats caused that... Unfortunately, there is about 3/335ths of absolutely nothing you can do about that other than reframing your target so it doesn't happen...
Reflections are the bane of an astrophotographers existance..
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