From: Milton Aupperle <milton@outcastsoft.com>

Date: September 30, 2008 11:29:11 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] UnFiltered Versus Light Pollution Filtered  Urban Imaging

Hi Willie;

Thanks.

The last 2 nights I've been trying to image M33 (up to 9 minute exposures for luma), without much luck. I can just barely pick out the some star clusters in the arms and a few bright "knots" ( reddish nebula patches), but nothing good so far. It may be just to faint for my urban sky conditions to do anything with.

My background skies at the dark site I was imaging at this summer unfiltered ran 5,000 to 8,000 for 20 minute exposures, whereas here in Calgary the background would be 65,535 after 13 minutes. Hopefully the weather this winter will be better when I'm back there for christmas.

Milton Aupperle

On 30-Sep-08, at 10:28 PM, Willie Strickland wrote:

Very interesting Milton.  I think the filtered images are quite

impressive for an 8" scope in an urban area.

Willie

Willie Strickland

cwskas@earthlink.net