<https://stargazerslounge.com/topic/310043-has-anyone-seen-this-effect/#comment-3390999>
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"I have an idea.  This is a QHY camera.  I had something similar happen to my QHY5 guide camera, and I discovered what it was.  Orientation and gravity can play a part if this is the same cause.  \n \n\n\n\tQHY seem to put foam inside the cameras and I found the foam had slipped on my QHY5 obscuring part of my guide screen.  I wondered what on Earth was going on at the time.  The picture you posted up of the Rosette with the yellow diagonal band looks very much like my guide screen looked.\n \n\n\n\tWhen you tip the camera in a different direction, the foam slips back into place.  Might be worth taking a look.\n \n\n\n\tI posted up a question on the QHY forum and Mr QHY said it was OK to remove it if need be.  I haven't done so yet as my foam is now staying in place.\n \n\n\n\tCarole \n \n"
<https://stargazerslounge.com/topic/310043-has-anyone-seen-this-effect/?tab=comments#comment-3390936>