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Hi Aidan,
I would guess perhaps one of the following - or a combination of them all..
- seeing, the jetstream hasn't been quiet enough to enable 'good seeing' - this is important you can't fight bad seeing.
- the telescope hasn't had enough time aclimatised to the outside air temperature - thereby creating turbulance inside the tube.
- the camera is not in focus.
- the collimation is not spot on (f4 is more temperamental).
- the camera settings are overexposing.
I'd recommend checking collimation and trying to point the camera on the moon first and see how you go, in particular in getting the focus right.
Good luck with it.
Rusty
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