RE: [APML] Mercury and Comet Utsunomya

["Chris Schur" <cschur@cybertrails.com>]

Philipp,

The 8 inch schmidt is f/1.5, hence the short exposures.  typically, under
extremly dark skies, exposures up to 6 minutes are possible with 400asa
film.  A dark box with arm holes is used to advance the film manually in the
film holder.  then a dark cap is inserted over the film holder until it is
mounted back in the camera.  For the "shutter" a dark piece of cardboard is
used in front of the corrector plate.  Whichever tail point directly at the
sun is the gas tail. I think its the left one.

Chris Schur

Astrophotography: http://www.psiaz.com/schur/astro/index.html


-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Philipp Salzgeber
Sent: Monday, May 06, 2002 12:09 AM
To: astro-photo@seds.org
Subject: Re: [APML] Mercury and Comet Utsunomya


Hi!

great shot Chris!

30sec exposure! I have no experience with Schmidt Cameras - hence my
curiosity: Do you have to take special precautions for
film-loading in twilight? What do you use as a shutter? The dustcap of the
objective lens?

The comet looks as though it has two broad tails- which one is  the ion- and
which the dusttail?

For me it was only clouds and/or work for the last two weeks...

Gerald Rhemann of Vienna has done a picture of the same subject (and then
some more):
http://www.astrostudio.at/UtsuVenusMerkurEben.jpg

here the comet alone:
http://www.astrostudio.at/UtsuMichBaum.jpg

here a nice animation of moving clouds and comet:
http://www.astrostudio.at/Video1.jpg

here an Image of Ikeya Zhang and Snyder-Murakami
http://www.astrostudio.at/IkeyaundSnyder.jpg

with Snyder-Murakami highlighted:
http://www.astrostudio.at/SnyderSW.jpg

I posted the direct links to the images, because the information about the
pictures is on other pages than the images themself, but
you can track down the information easily by entering the site from:
http://www.astrostudio.at


cheers

Philipp Salzgeber




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