Quote:
Originally Posted by gregbradley
You need dark skies for these or do they work in light polluted skies?
You will need long exposures. Any idea how much longer?
Greg.
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The narrower the filter, the brighter the sky you can accept (the filter rejects just about all unwanted sky background..a full moon/light pollution is not an issue
) . Exposures would be on a par with a 3nm..
That said it doesn't look like Oz has enough hard-core astro-imagers to make this one float.