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You guys are all so awesome! I’ve managed to clean the filters. Not perfect, but way better. Next time, I will use the isopropyl, but don’t want to be doing this too often, so will wait until really necessary - perhaps in a year or so (unless I smudge them again).
As for coma, I’ve worked out how to get 55-56mm, so I’ll experiment with 55 and 56 and see which performs better. Martin, the Baader ring was missing on mine, and the 16.5 was missing in the Thor’s helmet photo (although I had the 16.5 set up earlier that evening and still had coma). I’ve measured 55mm and am bang on now, so let’s wait and see.
Clear skies and thanks again to everyone,
Stéphane
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