[filmscanners] Re: "Halo" Effect

["Michael O'Connor" <omichael@optonline.net>]

Hi Joe,

   Sounds to me that this is more likely a problem with your unit rather
than the SS4000 as a class, though it could still be a design flaw. If
you don't have direct access to another SS4000 as per Laurie's
suggestion, maybe you could send a borderline reject slide from which
you've seen the problem to another listmember that has the model.

  It doesn't really sound like flare, it sounds like dirt or a light
path problem. Of course, the problem should then always be there, so I'm
curious, on your scans that don't exhibit the problem, is that by visual
inspection, or have you checked all the likely locations closely with
the densitometer? the densitometer should reveal that the flaring is
always there to some degree but obvious only on the high contrast
slides.

  (I haven't checked back through earlier messages, if you've noted
doing a similar check I don't remember that, but if that's the
case....never mind)

Michael O

Joe Pedit wrote:

> Hi Art,
>
> Thank you for your comments.  I left out some additional information
for
> the sake of brevity in my original post.  I also scanned the slide
> (Provia 100F) in different orientations (e.g., sideways, upside down,
> reversed) to check if the blue and red flares were a scanning
artifact.
>   The flares noted in my original post do not follow the stars when
the
> orientation is changed.  Instead, their size and location is always
> proportional to the vertical distance from the centerline as seen by
the
> scanner.  In the original scan, a star located near the center of the
> left edge would not have the red and blue flares.  When the slide is
> rotated 90 degrees clockwise, from the point of view of the scanner
the
> star is now located near the center along the top edge.  That star
would
> now show the red and blue flares when it did not in the original scan.

> It was based on this additional information that I assumed the red and

> blue flares were a scanning artifact.

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