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Thanks for the opinion Greg. The filters are 1.25" Baaders (7 of them so I think I will try to live with this size for a while!). I will try the micro fibre cloth trick too. So far I've only used compressed air.
Now, re the reflection I used the exact spacing and tubes with my G2-8300 without any reflection, bt that camera has an inbuilt wheel. So something in the setup is causing a massive reflection but only with the barlow. I speculated that it might be the filter carousel itself as it is quite shiny surrounding the filter and is visible to the barlow. But maybe it has something to do with the CCD window.
The shot of NGC1365 was only 5 min, but binned 2x2. It was done before I had attempted any cleaning. I had taken the darn system apart so many times chasing the reflection it was hopeless to keep clean.
Peter
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