Sorry, yeah know you were aware of the clip in filters, I was addressing the comments below, just got slack and didn't include the quote (on phone with 3 month old in my arms
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Quote:
Alternatively one could use a OIII filter (eg the Lumicon OIII shown here) to collect OIII across both green and blue channels of a DSLR
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2) could it be done effectively under moonlight?
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I can't see any probs with your idea.