"George Normandin" wrote in message
news
"Richard Crisp" wrote
...
the Custom Scientific 3nm FWHM filters were confirmed tonight to split
the very close emission lines of the [NII] doublet at 658.4 nm and the
Halpha line at 656.4 nm........

Richard,

Interesting image and I'm glad to hear that the filters 'work'.

......now if CS could just figure out how to lower the price........


well they are significantly lower in price than the AstroDon equivalent. I
think they are better too.

I like it when better is significantly cheaper




George N