<https://stargazerslounge.com/topic/310043-has-anyone-seen-this-effect/#comment-3390896>
<http://schema.org/text>
"We need to know camera, filters, filterwheel etc.\n \n\n\n\tThat's an odd one. Is the frontier between light and dark in exactly the same place in each sub?\n \n\n\n\tOften problems of electronic origin tend to follow the X and Y axes of the pixel array. That isn't the case here so I suppose it could be optical. If so it's a reasonably well focused artefact suggesting something close to the chip. Does your camera have a shutter? Could it be sticking?\n \n\n\n\tOlly\n \n"
<https://stargazerslounge.com/topic/310043-has-anyone-seen-this-effect/?tab=comments#comment-3390936>