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Old 07-11-2012, 09:11 PM
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RickS (Rick)
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Originally Posted by gregbradley View Post
You need dark skies for these or do they work in light polluted skies?

You will need long exposures. Any idea how much longer?
They should work well under dark or light polluted skies but the narrower bandwidth would be particularly good for rejecting light pollution.

I'd argue that you don't need longer exposures with narrower bandwidth filters so long as they have equally good transmittance. Any extra signal you get with a wider filter is not useful data.

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