From: Alan Friedman <alan@greatarrow.com>

Date: January 10, 2010 6:33:06 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: Mars from Toronto (now Mars from Jan10)

Hi Jim,

Some fine mars images in your recent posts, thanks for posting them... I have yet to find an opportunity on this side of the lake. Traveled to Atlanta this weekend where the temperatures were as cold as home... but there was not a cloud in the sky!

cheers,

Alan

On Jan 10, 2010, at 9:52 AM, jimchung2338 wrote:

Hi Willie, thanks!

I was out again this morning at about 1:30 and seeing was good and no wind turbulence so I was able to stack 130/1300 frames per channel at f15. I took the plunge and double stacked my barlows to get at least f30 (maybe even f50 looking at the image size) and the limits of seeing became very apparent. I found that I had to hand select my sharpest frames because AstroIIDC seemed to be confused by the presence of dust motes perhaps giving false sharpness values.

http://tech.groups.yahoo.com/group/Astro_IIDC/files/Planetary/MarsJan10c.jpg

I had wanted to compare how my C8 on a GEM would compare but it was getting a little too cold. The 12" mirror was definitely instrumental in shooting Mars at 15 fps at 8 metres focal length!

Jim