25 Jan
2009
25 Jan
'09
11:24 p.m.
I haven't had much chance to use my OIII filters since I bought them, but I can say that they do make a difference in the valley. Probably the darker the site, the less they offer in terms of increased visibility. On Sun, Jan 25, 2009 at 11:18 PM, <zaurak@digis.net> wrote:
My experience has been that O3 filters are of little help with many planetary nebula, a consensus on wether it helped with the Helix did not occur at SPOC with many experienced SLAS observers last year. It is kind of large for the Grims' general field of view. The best views come from smaller lower magnification scopes (IE <32").