I am looking to purchase this narrowband filter as it covers Ha, Hb and OIII. This way I get Hydrogen Ha in Red, Hydrogen Hb in Blue and OIII in green.
See attached freq response curve.
I am thinking of using it as a luminance channel to complement my QHY-12 OSC.
Ebay link here,
http://www.ebay.ca/itm/Filter-Astron...item485b3f7fbf
Cheers
Bill