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I prefer the DGM NPB Nebula filter for all visual nebula work. OIII is smack dab in the middle of lthe sun light reflected from the moon, which is why it really can't be used for narrow band imaging when there is any moon light around. It passes teal coloured light around the 520nm part of the spectrum. There are reviews of the DGM NPB published online and in pdf via Cloudy Nights forum - worth a read.
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