David, I sort of thought that would be the case, but I'm wondering how imaging would be from SPOC where the light pollution isn't great. A few years back we could still see 6.5 magnitude stars overhead - I don't know how bad the light has become since. The Ealing is the 16" reflector (classical cassegrain?) installed at SPOC, I believe in 2002. It was the first scope to see "first light" in what became the Harmon's Observatory building. It was originally located at the U of U physics building, where I remember looking through it in 1972. Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of David Rankin Sent: Thursday, September 09, 2010 9:38 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Please advise Kim, Light pollution really kills deep space astrophotography. I think that it is because a lot of the visible light coming off of the objects is the same wavelengths as the light pollution. You get this fog in the image and when you try to remove it, it starts to eat away the data from the object you were shooting. I have tried LP filters with little success as well. One way around it is to shoot in HA only, as it wont pick up any of those wavelengths. I don't have an HA filter for my dslr yet :(. I have never been to spoc though, may come out there anyway. What is the Ealing? Cheers