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Thanks all for your suggestions and support
Greatly appreciated
I’m going to start from the bottom up and check off item by item until I find an answer on the issue
I don’t think the cause of the noisy image is entirely atmospheric conditions
Checklist
Reload update Ascom 6.6
Reload update Microsoft .Net Framework
Reload update both ZWO camera drivers
Update APT capture software
Clean camera sensor
Clean protective window on camera
Replace desiccant
Replace camera cables ( already done )
Perform cooling test for 3 to 4 hours ( already done )
Clean mirrors on scope
Re collimate scope
Clean L Extreme filter
Next clear night/s perform capture plan on object using Gain 100 with and without L Extreme filter for various exposure lengths 1 minute , 2 minute and 3 minute exposures
Perform capture plan using Gain 0 same as above
Hold off on a ZWO firmware update as this is only required when camera will not connect or operate via Ascom
Hopefully after all the updates , checks and testing I’ll get a definitive answer
Worse case scenario is sending the camera away for servicing and testing
Cheers
Martin
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