RE: [APML] Help! new scanner analysis rainbow streamers

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

Jeff, those streamers remind me of an internal reflection inside some
prismatic type optics, rather than something like blooming spikes.  If im
right, you wont see them when you scan a negative instead.

Chris

-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Jeff Ball
Sent: Friday, September 27, 2002 8:54 PM
To: astro-photo@seds.org
Subject: [APML] Help! new scanner analysis rainbow streamers


Well, I really don't know what to think.
I just put my Minolta Dimage Multi Scan pro thru some hoops.  I have these
rainbow streamers.  Are these  Newtonian rings or similar artifact?  I saw
these with the glass and glassless holder.  Looks like they become more
elongated and separated from the culprit star the further out you go from
the center of the FOV.  Any help in diagnosing this problem and finding a
solution would be helpful.  I hope the solution is to not return the
scanner.  It has worked well so far.
here is the link

http://www.astro-photography.com/ic1396.htm

IC1396: 2x 100 minute e200 pushed one stop on 130EDT with Pentax and field
flattner.

Thanks.
Jeff Ball


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