Chroma OIII 3nm Narrow Band Filter
OIII 3nm Narrow Band filters isolate the doublet emission of doubly ionized Oxygen.
After ionized hydrogen, this is the next most common emission when imaging nebulae.
Doublet emission occurs at 495.9 and 500.7 nm.
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Jonathan Bennink –
The Oiii 3nm is the reason I started looking into upgrades from my 7nm ZWO filters. The 7nm you can only use during no moon and at bortle 5 or less. This 3nm version made by Chroma is a different product entirely. What a joy to use, and now I can image during half moon or less and under light polution. No sign of internal reflections, even on mag 1 or 2 stars. Incredible. My rig is 5000 pound,, so yeah, these filter hurt a bit, but compared to the rest it’s ok. It only hurts once!