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2008~2012
 
Nebula Red filter

Nebula Red filter

The most of red nebulas emission lines are from the ionized H-α(656.3nm), N-II(658.3nm) , S-II(671.7 &673.1). This Nebula Red Filter was designed for these 3 region ionized emission lines passing through. The FWHM of this filter is 30nm. This filter can make a high contrast astrophotography without the bad light interference even in the full moon night.