Astronomik OIII CCD 2" Filter in pristine condition, has only ever been used once when I screwed it onto my TV 35mm Panoptic in an attempt to use it as a light pollution filter for viewing nebula in the burbs of Melbourne. I have since purchased a full set of 3nm 36mm unmounted Astrodons so I doubt I'll ever use it on a camera and it has only ever been used the once otherwise so better someone else gets some good use from it.
http://www.astronomik.com/en/fotogra...oiii-12nm.html
It has been a while since I bought it and there is no mention anywhere of its passband so I am assuming that it is the 12nm as I and almost certain that it wouldn't have been the 6nm.
Looking for $280 posted.