Re: [APML] 2 More ST-4 questions

["Eddie Guscott" <eddie.guscott@blueyonder.co.uk>]

Stuart

I think your 20 min exposure may have overexposed Jupiter sufficiently for
you not to see it's moons.

I tried several shots a few weeks ago, ranging from 1 min thru 15 minutes.

The 3 minute was best. At 7, 10, 20 minutes the overexposed glare around
Jupiter overwhelmed the moons (at F9)

You can see my 3 minute attempt here:

http://www.astropics.co.uk/jupiter_m44.jpg


Eddie Guscott




----- Original Message -----
From: "Stuart Heggie" <stuart.j.heggie@sympatico.ca>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Sunday, April 27, 2003 1:34 PM
Subject: Re: [APML] 2 More ST-4 questions


> Oddly, it was clear as a bell here in Southern Ontario (but cold still,
near 0C).
> Our club had an imaging workshop so I went with my portable SP mount and
4"
> refractor. I piggybacked my shorter lenses for some constellation shots.
Took a
> 20min guided-by-eye shot of Jupiter in the Beehive with a 180mm ED lens
(Supra 400
> at f2.8) - maybe too long given how bright Jupiter is. Will see. The rest
were 10
> min tracked-not-guided 50mm and 24mm shots of constellations (Leo, Big
Dipper,
> Hercules, Scorpius).
>
> Stuart
>
> steve banbury wrote:
>
> > Hi John/Alan--
> >
> > "John C. Mirtle" wrote:
> >
> > >     Ha! Got you beat - we are in the middle of a full-blown blizzard.
It's
> > > chest deep with snow in parts of my yard, and it is supposed to keep
snowing
> > > until Monday. Looks like this new moon is a wipe-out as well.
> >
> > We have rain here in Calif, and Alan's weather in Oregon doesn't sound
any
> > better.
> > Isn't anybody having decent weather?!!
> >
> > The way I look at it-- the rate of change in temperature on the CCD must
be
> > greater when actively being pulled down from ambient
> > by a Peltier device compared with the rate of change when passively
drifting
> > back up.  Still it might not be a good idea to drag the CCD into a 70
degree
> > house from your snow laden back yard as soon as you're done imaging or
guiding.
> >
> > Steve
> >
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>
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