Re: [APML] 2 More ST-4 questions

[Stuart Heggie <stuart.j.heggie@sympatico.ca>]

Eddie, that is a nice shot!
What film were you using and what were you shooting through that is f/9?
Three minutes at f/9 is not a lot of time no matter how fast your film!

Stuart

Eddie Guscott wrote:

> 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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