Quote:
Originally Posted by doppler
Hold the mirror up to a light and look from behind, if there are bits of coating missing you will see the light through them. The coating is thin so some light may show but any bad blemishes will really stand out. Looks like dust to me on your pic though. A bit of water won't hurt the cell and the colimation won't go out by much if you leave the mirror in the cell.
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I thought it was dirt at first too until i examined it under a loupe too, and the light test looks pretty terrible:
https://imgur.com/a/P03p8
Thanks for all the tips, great help, now I can make a well informed decision.
Cheers.