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Thanks. Yes the Eos Ra has an IR cut filter, it extends into the H Alpha band like a modded DSLR but has a white balance to give normal daylight colours, making it suitable for non astro photography as well.
The duo narrowband filter works OK, though I wish I could get one that does S2 and H beta as well. I don't think such 4 band filters are available as a clip in filter. I cannot use the 2 inch screw on type as it is ahead of the guider pick off prism, and it would make guide stars impossible to find.
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