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Green is due to light pollution and airglow - I get the same with my QHY8. Rings looks like an interference effect. A few things that you might look at - clutching at straws a bit though:
- does it occur if you take a flat field image through the optics?
- was the QHY8 dried out properly before use - maybe a film of condensation or ice somewhere?
- Did you have moonlight falling directly onto the front surface of the lens?
- what filters did you have in the system?
- was the sky very hazy, or with thin high cloud?
- Is it possible that any optical components have a thin film of fingerprint grease or oil on them?
- is this a new effect (has the system worked OK before this)
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