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Re: [APML] New Image: Comet Ikeya-Zhang
Great shot, Jeff,
the best film shot Iīve seen so far!
Because the image looks a bit grainy for my eyes, I was playing around with
SGBNR a bit and the tool shows itīs power very impressive, I think.
Please allow me to show your image on my website, only to show how it will
look like, when SGBNR was used. Here is the link:
http://www.spiegelteam.de/Kometen/IZSGBNRjJeffBall.jpg
Thanks for sharing this image with us,
Volker
www.spiegelteam.de
> 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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