I have found the OIII to improve the contrast of the Veil, Planetaries and nebulas like Orion, the Eagle and Lagoon. I think that the OIII helps the Veil and the planetaries the most. Are these OIII emitters?Some of the nebulas become better with a UHC but I think that I like the OIII the best for most of the observing that I do. -----Original Message----- From: Chuck Hards [mailto:chuckhards@yahoo.com] Sent: Friday, March 14, 2003 1:27 PM To: utah-astronomy@mailman.xmission.com Subject: Re: [Utah-astronomy] Urban astronomy --- UTAHDEB@aol.com wrote:
I think an OIII filter is required for city observing
Do you mean required for the Veil, or city observing in general? An O-III filter will only improve objects that are emitting light at the O-III wavelength. C. __________________________________________________ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy