Quote:
Originally Posted by asimov
You know, I'd LOVE to know exactly how much dust could be on a primary before it becomes 'noticable' at the eyepiece. And what about astrophotography?? I wonder if this is less tolerant of dust on a primary mirror.
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That's a good question John.....we need a dirt-o-meter to check it.
I'm fairly regular at cleaning my mirrors...1998-9,chasing Pluto...2000-1 crazy Comet chasing bug....2003..Mars......2005..Deep Impact.
Yep, every couple of years whether it needs it or not

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There IS a difference to be seen afterwards and this is a scope that is well sealed when not in use.
Doing Imaging I'd expect it would pay to be more fastidious and wash it more often.