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Has anyone seen this effect


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This is pretty odd. My first thought was a filter wheel had not rotated fully, blocking some of the chip, mainly due to the different amount of the dark band from the initial pic to the Rosette one. I have not seen anything like this on any set up I have used, but it sure looks like a physical obstruction rather than a camera effect. Is the mount flipping between the objects where it comes and goes? Like what Carol is saying, is gravity shifting something?



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I'm no expert, but could it be a very slight gap allowing light to leak into the OTA somewhere when in a particular orientation, perhaps in line with nearby lights? The fact that you can apparently see stars in the background is also odd - are they the right stars in the right location (can you compare to any previous subs of the same target)? Be worth checking that everything is tightly coupled.

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