[APML] flares/rainbows around stars -- followup

[Joe Pedit <pedit@email.unc.edu>]

Over the past year there have been reports of flares and rainbows around 
stars in images scanned from slide film.  Some of the APML threads with 
examples include:

"red and blue tails on stars?" thread:
<http://astro.umsystem.edu/apml/ARCHIVES/NOV01/msg00070.html>

"Best recent model 120 format scanner?" thread: 
<http://astro.umsystem.edu/apml/ARCHIVES/OCT02/msg00109.html>

Jeff Ball's example:
<http://www.astro-photography.com/mediumformat.htm>

I first noticed this problem on my 3.5 year old Polaroid Sprintscan 4000 
the first time I scanned an astro slide about a year ago.  Polaroid 
recently determined the problem to be a slight misalignment in the 
scanner's CCD, so the problem seems to be with individual units and not 
particular scanner models.  The estimated cost to align the CCD is 
between $400 and $660.  The upper estimate is about the current price of 
replacing the SS4000.  The lesson learned is to test your scanner with 
an astro slide during the warranty period.

Joe


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