Hi all and thankyou for your comments.
Gary, Star Atlas Pro list it's size as 0.80"
Andrew, I think it would be a show stopper seeing it through an Obsession dob or similar.
Jase, I had applied darks but there was no flats. Flats are now the next step of my learning curve to kill off those dust bunnies. I am a lot happier with my imaging/focussing techniques now, thanks for your advice and tips in previous threads.
Cheers
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