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Hi Paul - I'm also interested to find out why the silicon is there - I personally don't think that it serves any practical purpose - I intend to go up to the observatory today and to try and cut the silicon out - I will then wait a couple of days for the optics to settle and hopefully see some improvement in image quality.
The quality of the mirror is not in dispute, to give a 4 pixle star in that sort of situation, with a quick manual focus is better than OK.
Cheers
Geof Wingham
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