Re: [APML] Image: Jeff Ball's Comet Ikeya-Zhang

["mstecker" <mstecker@dslextreme.com>]

Bert:
     Great comet shots!  What was the field of view in your CCD images of
the comet?


Michael Stecker
mstecker@dslextreme.com

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----- Original Message -----
From: "Bert Katzung" <katzung1@attbi.com>
To: <astro-photo@seds.org>
Sent: Friday, March 22, 2002 2:07 PM
Subject: Re: [APML] Image: Jeff Ball's Comet Ikeya-Zhang


> Jeff, that is a great comet shot---one of the best yet! What do you figure
> is the FOV of your 6x7 on the A-P 130? About 4.5 - 5 degrees? Was the shot
> cropped? I assume you use the A-P flattener? Keep up the good work!
> My latest effort is at
> http://www.astronomy-images.com/images/comets/Ikeya-Zhang-14-18-Mar.htm
but
> not as nice. I've got to get my 6x7 hooked up!
> Bert
>
>
> ----- Original Message -----
> From: "Jeff Ball" <jeffball@netacs.net>
> To: "Astro-Photo" <astro-photo@seds.org>
> Sent: Friday, March 22, 2002 12:00 PM
> Subject: [APML] New Image: Comet Ikeya-Zhang
>
>
> > What a nice comet.  Hope you have had a chance to view it.  Here is my
> > shot from March 10.  A special thanks to Kirk Rogers for scanning the
> > slide!  The tail has changed so much from day to day.  This is one 15
> > minute shot on Fuji Provia 400F.  I have now shot with this film on two
> > occasions and I must say I am very impressed.  The grain structure is
> > very small.  It looks great on galaxies.  It seems to have worked well
> > on Comet Ikeya-Zhang.  I am now back to using medium format thanks to
> > this slide film.  I used PW pro to remove some vignetting and then the
> > Sean Walker method for removing some uneven field illumination.  My
> > first attempt at removing uneven field illumination with the Sean Walker
> > technique resulted in some "wavy" artifacts near areas of transition
> > from lighter to darker areas.  Using PW Pro oval gradient and then using
> > the S. Walker technique helped minimize these artifacts.  I went with a
> > blur of 70 pixels I believe.  I used a slight smoothing with SGBNR on
> > the darker background.  Still not as smooth as I would like, but, it is
> > my best for now.  Hope the show gets better in April!  Comments welcome.
> >
> > http://www.astro-photography.com/i-z.htm
> >
> > Jeff Ball
> > www.astro-photography.com
> > Ohio Valley Astronomical Society
> > www.ovas.org
> >
>
>
>
>
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