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An old rule of electronics fault finding is the "Half split" rule (In any fault finding of multiple components, check if the system is operating properly in the middle either physically, or conceptually as per the below, and keep splitting the system in half over and over until you localise the fault) In this case the first half split would be to determine if it was in the camera or the optics (Or just sky conditions)
To do that I would rotate the camera by an arbitrary amount compared to the scope and then image the same target. If the gradient stays the same with respect to the image frame then it is in the camera, if it stays the same with regards to the orientation of the target then it is coming from the scope or light pollution/moon glow etc.
Half split again, as unlikely as it is to be in the scope/flatteners (If you are using one) etc, rotate the entire scope/camera train as an assembly (I assume as a refractor you probably have it in rings?) and image again. If the gradient stays the same with respect to the image frame then it is coming from the optics somewhere, if it stays the same with respect to the target then it is coming form the sky and there is not much that can be done about it aside from picking a different target that is not impacted unless it is a neighbors outside light or something like that.
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