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Old 11-07-2020, 07:59 AM
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pmrid (Peter)
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Baader H-alpha 35nm filter for Interline cameras

I found one of these filters (at the bottom of the filter box) and can't remember where or why I bought it. With a bandpass of 35nm it seems an unlikely choice for most of my cameras.

I was wondering if anyone had any thoughts on this. With that sort of bandwidth, would it be a reasonable match for a DSLR, for example?

Peter
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Old 11-07-2020, 08:17 AM
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Merlin66 (Ken)
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Should work as a light pollution filter, only allowing the spectral wavelengths around H alpha to be recorded.
It's widely used as an energy rejection filter (ERF) on solar imaging set-ups.
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