Thanks Marc
That's exactly my plan. Am going to wait for the current run to finish and then I will pull the train apart and try and figure it out. want to at least get some useable data! Just got my first OIII sub of this run and it's fine so may try a bi-colour image just using SII and OIII for something a little different.
I just wanted to make sure my thinking was correct. This filter wheel uses little plastic masks that hold down the unmounted filters so I am thinking that may be where the issue lies.
Malcolm
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