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Thanks Chris, I have been seeing lots of images from newbies and near newbies with misshapen stars over the last year or so. I suspect it is because
many of today's newbies are not content to use a simple DSLR setup while they learn the basics of imaging, but get all the bells and whistles such as
coma correctors, extension tubes, filter wheels, and often heavy dedicated astro cameras, all of which introduce the probability of camera sag, and
spacing errors.
raymo
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