Hi Everyone,
I am selling a Baader 2" Semi-APO filter. This filter is a combination of Baader's Moon & Skyglow filter and Fringe Killer filters. Ideally used to remove skyglow in the city or moon glare out of dark skies. The fringe killer component then helps reduce violet fringing common in Achromat refractor telescopes. Having both filters in one minimises light loss over using two separate filters.
Here is an interesting thread (in German!) comparing this filter to others:
http://www.astro-foren.de/showthread.php?t=5719&page=2
This filter normally sells for $295 brand new. I have used it only once but will sell for $195 including postage.
Thanks
James