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Thank you for your input guys.
The Halos are from over excited processing in the star reduction phase rather than dew or dust. I see the tilt though. This doesn’t surprise me as I sometimes have similar issues when using my Newt. I think to help this I’m going to reduce the weight of the camera by moving the remote intervelometer from the hot shoe to my distribution box and just run another cable to the camera.
Re: OAG, I’ve been reluctant to go down this path because honestly I don’t know how well the Nexguide will handle it. It’s pretty fussy with the brightness of stars and is really quite sensitive to focus. Given that it only gives me a digital representation of stars rather than an image, I think it might be quite hard to get right. I agree though that OAG is the ideal way to go for such long focal lengths.
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