RE: [APML] 'challenge'

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

Bert, one could argue that the short exposures used to capture the sun also
had multiple images of the background scenery, albiet quite dim! but still,
its earth and the sun, two separate objects moving by eachother.  Taking a a
shot of the sun, and adding the background as a multiple exposure later is
just like shooting saturn, panning around and shooting M42 on the same piece
of film.  Its fake.

Chris

-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Bert Katzung
Sent: Thursday, December 19, 2002 5:58 PM
To: astro-photo@seds.org
Subject: Re: [APML] 'challenge'


Hi Chris:
Wow---pretty stringent criteria! Seems to exclude multiple exposure eclipse
photos like my
http://www.astronomy-images.com/images/Solarsystem/partial-solar-eclipse-mul
tiexp.htm
in which I superimposed one multiple exposure of the sun with one single
shot of the landscape.
I didn't feel I was cheating in doing that, even though the sun was not in
the FOV when I shot the landscape.
Or did I misunderstand the criteria?  I don't remember the Saturn - moon
paste-up in Astronomy. What issue was it?
Bert

Bert Katzung
katzung1@attbi.com
www.astronomy-images.com

----- Original Message -----
From: "Chris Schur" <cschur@cybertrails.com>
To: <astro-photo@seds.org>
Sent: Thursday, December 19, 2002 2:41 PM
Subject: RE: [APML] 'challenge'


> I have to strongly disagree with those who say its OK to composite an
image
> and think of it as anything like a challenge.  I can do that tonight, with
> an atlas for a guide as to where saturn is going to be, and thats
cheating.
> Wouldnt it be clever, if we could think of a way to REALLY get the image,
> real time?  Not some pasted together fake, but an actual image.  I can
think
> of several ways to do this.  My first thoughts are to shoot with the Ha
> filter and CCD, and determine the maximum exposure in seconds so saturn
just
> doen not saturate.  Than add bunches of those, that can fit within a
narrow
> 10 or 15 minute time frame so saturn does not move very far between shots.
> You will end of with (I hope!) a black and white REAL image, fully
> appreciated by your peers as a worthy effort to the upcomming january 4th
> challenge.
>
> Sorry I feel so strongly about this, but after Astronomy Magazine
published
> the moon-saturn paste up a number of months back, I shudder at the thought
> of what things could come to if this is taken for granted.  I would like
to
> hear others thoughts on this, the use of masks for example during
exposure,
> or whatever.
>
> Ok, shoot me.
>
> Chris Schur
>
> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Matt BenDaniel
> Sent: Thursday, December 19, 2002 2:00 PM
> To: astro-photo@seds.org
> Cc: direland@drdale.com
> Subject: Re: [APML] 'challenge'
>
>
> Dale,
>
> It depends on the "rules".  You could take a long exposure of the Crab
> before Saturn crosses it.  Then you could take a short exposure of Saturn
> as it crosses.  Assuming you register the images on the stars, would that
> be "fair"?  It can even be accomplished without using any digital
> technologies (although I would).
>
> Matt
>
>
> Dale Ireland said:
> > Saturn passes across the Crab Nebula Jan 3. That should be a real photo
> > "challenge"
> --
> Matt BenDaniel
> http://starmatt.com
>
>
>
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