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grab your telescope and inside your home put the focuser to a bright light, if you can see light though the front objective and out the back just be wary when your imaging aka, computer screens, LED lights from power sources etc etc etc will all be a little bit of a nasty cause!
With my imaging rig you will see in the photos of it that i have what i call "The Shower cap" I was getting really strange circular effects kind of like vingetting. but all it the issue came down to was light slipping past the rear mirror and getting in that way.
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