From: Alan Friedman <alan@greatarrow.com>
Date: January 10, 2007 12:16:47 PM MST
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Re: New Luna Images
I second Tim's comment - the full disk lunar image is very nicely done with great processing too.
On the dew/ice front - My 10" mak has a long (maybe 15"?) dewshield. For an early morning session I leave the scope out the night before, tarp wrapped and covers on, set the alarm and uncover right before using. If humidity seems a problem I wrap the dewshield in a 1/2" thick foam blanket that I keep inside, letting it extend another few inches out from the dewshield. This holds up very well for a 2 hour imaging session. I hate to use a heating strip for high resolution imaging, but I do use one for visual observing on a long night where dew is going to be a problem. I never use the hair dryer. A lot of friends do, at the end of the night out at our rural club observatory. Not sure if it's a bad idea, but I hate the noise after a quiet and peaceful night of observing!
best -
Alan
On Jan 10, 2007, at 1:48 PM, Tim wrote:
Milton:
I like the results you're getting with the color flea2! (especially
since I now have one).
I noticed your remark about ice crystals on the corrector. I have
this problem with my C-8 as well, for which I don't have a dew
remover (like I do for the 9.25", but that's not currently mobile).
When I was in Utah in October, I had 5 nights at about 20° F. The
first night was the most humid (high desert at around 5000ft, usually
dry), and I was trying long exposures with various cameras. I slept
during the exposures, and when I went out to put the equipment away,
the corrector on the C-8 and the objectives on the Jaegers 6" and
Megrez 80 were completely opaque there was so much ice on them. I put
them in the spare bedroom in the house without the covers on, so they
could defrost and dry.
At home, when I'm using the C-8 in humid conditions, I actually use a
heat gun to remove the dew, being very careful to keep it moving and
hold it a foot or more away from the corrector.
-Tim.
--- In Astro_IIDC@yahoogroups.com, "Milton Aupperle" <milton@...> wrote:
>
> Hi Folks;
>
> Despite some issues with my HEQ5 mount (it really doesn not like -20°
> Centigrade weather), I still managed to get a little bit of imaging in
> over X-Mas.
>
> Here is the 15 day old moon and a detailed strip along the western limb.
>
>
http://groups.yahoo.com/group/Astro_IIDC/files/Lunar/20070104_MJA_Luna.jpg
>
>
> It's scaled down by 50% from the original and was shot using a color
> Flea2 1032x776 camera with a Focal Reducer on the C8 (1000 mm focal
> length). Seeing was about 5 to 6 / 10 turbulence, but I had 50 to 70
> km surface winds blowing the mount around. It's a composite of 14
> movies for the full disk and the details strip is another 9 movies.
> Exposure times were 3 ms per frames, so you can pretty well freeze out
> any turbulence.
>
> And here are the normal and enhanced color images of the 7 day old
> moon at:
>
>
http://groups.yahoo.com/group/Astro_IIDC/files/Lunar/20061227_MJA_Luna.jpg
>
>
>
> I also managed to capture the Valentine Dome then too.
>
> TTYL..
>
> Milton Aupperle
>
__._,_.___
Messages in this topic (2) Reply (via web post) | Start a new topic
Messages | Files | Photos | Links | Database | Polls | Members | Calendar
<ma_grp_160.gif>
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe
Recent Activity
4
New Files
Visit Your Group
SPONSORED LINKS
▪ Preventative maintenance software program
▪ Preventative maintenance program software
▪ Image acquisition
▪ Computer software program
▪ Help desk software program
Yahoo! TV
Love TV?
Listings, picks
news and gossip.
New business?
Get new customers.
List your web site
in Yahoo! Search.
Drive Sales
Connect with
customers who are
searching for you.
.
<transparent.gif>
__,_._,___