Re: [APML] saturn occ. time exp.

[Adam Stuart <eisenklein@yahoo.com>]

Speaking of The Sky, can you give me a few pointers in
order to be able to step-through the path that saturn
takes in the sky on November 30th? How do I view the
moon and saturn during a time sequence in enough
detail? Do you just zoom-in on the screen?

Thanks.

ADAM
--- Glenn Graham <glenng@synopsys.com> wrote:
> Very true about the difference in "good" exposure
> times for Moon and
> Saturn. Along the edge of the Moon's terminator you
> can use a good
> Saturn exposure time and still see some Lunar
> detail. Where are you
> located? I would check, using a program like "The
> Sky", to see what path
> Saturn will take with respect to the Moon and its
> terminator. If Saturn
> passes near that point before or after it gets
> occulted, that might be
> your best bet to get a pleasing photo. You can
> correct for some of the
> over/under exposure afterwards if you scan and
> process the photo.
> 
> I got a nice video of September occultation using an
> STV camera. I have
> a sped up version (every 100th frame) at:
> 
> http://home1.gte.net/res0jwg1/astronomy/index.htm
> 
> It might also give you a feel for the difference in
> brightness you will
> have to deal with.
> 
> Good luck,
> -Glenn
> 
> 
> Bobby Middleton wrote:
> 
> > I'd suggest that you plan to use a high total
> focal length for this.
> > Eyepiece projection is one way if you have the
> projection tubes. At
> > short focal lengths you will be mis-matched on
> your exposures. Either
> > the moon will be over-exposed or Sat will be
> under-exposed. High
> > magnification at long fl's will get the two
> objects close to correct
> > exposures. If you can design your system to get
> you 1/2 to 1 sec
> > exposures that will be best. Use the hat-trick for
> your shutter to
> > minimize vibrations For your instrument, an
> 16-18mm eyepiece with a
> > 120mm projection distance will calculate at 1/2
> sec exposure for a 200
> > speed film; 1 second for 100 speed film.Bobby
> Middleton
> > "To think that the eye could evolve by natural
> > selection seems I freely confess absurd in the
> > highest possible degree"    CHARLES DARWIN
> > http://www.koyote.com/users/bobm/astro1.htm
> >
> >      ----- Original Message -----
> >      From: Marios
> >      To: astro-photo@seds.org
> >      Sent: Thursday, November 01, 2001 7:08 AM
> >      Subject: [APML] saturn occ. time exp.
> >       Hi friends, I would like some advises for
> time exposures
> >      for the Saturn Occultaion on the 3rd of
> November (this
> >      Saturday) I will be shooting Prime Focus with
> an 8" f/5
> >      F1000 Newtonian telescope. I will mount the
> camera on the 2"
> >      focuser.Shall I use a fast film (800 ISO?) or
> a slower? What
> >      would be the time exposures? Thank
> >      you. Marios.www.CyprusAstronomy.com
> >
> 
> 
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