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Re: [APML] New Image: Comet Ikeya-Zhang
Good shot Jeff; one of the best I've seen so far. How did you guide? Will
the comet's aparrent motion slow down as it gets nearer the pole?
Bobby Middleton
"For we did not follow cleverly devised tales when
we made known to you the power and coming of
our Lord Jesus Christ, but we were eyewitnesses
of His majesty." II Peter 1:16
----- Original Message -----
From: "Jeff Ball" <jeffball@netacs.net>
To: "Astro-Photo" <astro-photo@seds.org>
Sent: Friday, March 22, 2002 2:00 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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