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How dirty is too dirty?
I recently bought a GSO 250 F4 reflector and am in the process of setting it up for imaging.
I know mirrors don't have to be perfectly clean but what's the general opinion on when to clean?
Below is the mirror in question. Without a torch or flash pointed directly at the mirror it doesn't look that bad. Shine a torch down and "Whoa, how does that mirror reflect anything?".
What are your opinions?
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