I've posted on another forum here on Cloudy w this question...
a few answers ...suggesting its for
astrophotography uses .... 7nm??
....but I'm wishing for more input to be better informed.
>I"m Still ... trying to exactly ID this filter I bought on a scope deal.
The only markings on it: " Korea Orion H-ALPHA filter "
As I'm going to sell it ...( I've NO solar gear, nor plans to image .. I only do visual observing ..)
...Does ANYone out there have a clue about this filter/specs etc.???
I still CANNOT find this exact filter anywhere on the net. Yet, its printing is for certain our
well-known 'Orion Telescopes and Binoculars' company USA ... ( not the UK Orion ive seen ads for )