Ahh, that's interesting. I contacted these guys back in Feb to see if they could do some narrowband filters in 3nm-5nm with 90%+ transmission and they couldn't do it. Said they could do +/- 15% of the center wavelength with that kind of transmission, but no better.
Could be worth a look. I'd be interested to see how they go with halos. I'd go in expecting disappointment with something this cheap, but hoping for something decent.
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