From: "Duane" <macastronomer@mac.com>

Date: November 13, 2005 12:42:33 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: Mars image Nov 13/05 - advice?

Hi Jim,

I am by far an expert, but here is what my book smarts might say about that...

5x might be too much at 76mm aperture) I'm starting to think it's a bit too much with my 

100mm.

Try a 2x and then go a little more (?) just to see how it turns out.

If you're not using IR, you need to throw that in.

Last but not least I think that your shot looks like most of my shots and this might be 

100% seeing conditions. Keep getting out there and pray for clear seeing.

Duane

--- In Astro_IIDC@yahoogroups.com, "jimchung2338" <jim_chung@s...> wrote:

Hi all,

This is probably my best attempt at imaging Mars through my 17 year old TV 76mm 

Oracle refractor - a triplet apochromatic.  I simply cannot get any more detail and I 

think the focus is optimized as is the brightness.  Is this simply a function of small 

aperture?  

Again taken through a 5x Powermate at approx f37, 120 ms exposure stacking at 

80% confidence level with a Unibrain webcam.  BTW there was some discussion than 

the Unibrain has a nonstandard thread/size and I know for that reason that Mogg 

won't make an adaptor for it.  I found some plastic electrical conduit threaded pieces 

that you screw directly into the webcam case (after removing lens assembly)  and 

some light sanding brings it 1.25 " size.

http://groups.yahoo.com/group/Astro_IIDC/files/Planetary/marschung2.jpg