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Hi Malcolm,
Like the first image, a nice job there.
Any spots or dust mots that you are seeing on your live feed are not from dust on your primary mirror, they will be from minute spots of dust on your CCD. Not sure about the configuration of your CCD, some have clear glass over the top to protect the CCD itself and dust mots are relatively easy to clean off of them. It would pay to track down some one else using the same CCD as you to find out how they clean it.
Regards
Trevor
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