Kurt, Even when I lived in Orem and had terrible light pollution, I could do narrowband imaging. Hydrogen-Alpha is particularly easy. You can do 20 minute exposures, from a light polluted site, with a fast scope, and still get a background that is almost black, with no gradients. Oxygen (OIII) is more sensitive to the light pollution, but still pretty easy to do compared to visible light. I have only done Sulpher (SII) imaging from the new observatory and my light pollution isn't too bad here, so I can't comment directly. However, I have seen exceptional narrowband images taken from big cities, that use all three bands effectively. That is my 2-cents worth. Cheers, Tyler PS - I am beginning to see some images that use Hydrogen-Beta wavelengths as well. -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Canopus56 Sent: Tuesday, November 09, 2010 10:08 PM To: Utah Astronomy List Serv Subject: [Utah-astronomy] ST Dec 2010 Urban narrow band imaging The Dec 2010 issue of ST at 72-75 by N. Fleming suggests that useble imaging can be done from an urban location by using narrow band OIII, Ha and SII filters. The article includes, on page 73, an excellent image taken from "the suburbs of Boston, Massachusetts." I was wondering if anyone locally had done any "urban imaging" using this technique and what they thought of the idea. Clear Skies - Kurt _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com