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      :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

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RE: filmscanners: Stains and Grains (was Yellow Stain)



Hi Frank,

OK, then that would mean that the sensor array is vertical to the line of 
travel, and the scan is horizontal, as we thought, and that makes sense. Now 
optics *could* cause light drop-off, but frankly I don't quite understand 
how that mechanism works, either. I'd almost have to see it--and 
conemplating that, what I *see* is a part or two left over after I've 
re-assembled my Scanwit! ;-) (I actually *did* that with an electric 
typewriter, once. For some reason, it still worked! :-))

Best regards, and keep us plugged in--LRA


>From: "Frank Nichols" <frank@theNichols.net>
>Reply-To: filmscanners@halftone.co.uk
>To: <filmscanners@halftone.co.uk>
>Subject: RE: filmscanners: Stains and Grains (was Yellow Stain)
>Date: Fri, 6 Jul 2001 12:59:52 -0600
>
>Lynn,
>
>No, the light source and the CCD remain stationary while the carrier moves
>past. The hot center is along the axis of movement - ie. if you held a 
>paint
>brush against the negative and moved the negative horizontally past it you
>would end up with a stripe along the negative where the brush wiped. So, 
>the
>darker stripes along the edges are not a function of the movement.
>
>I still think the ultimate problem here is in the optics - it just looks 
>too
>much like a dispersion or defraction problem. However, I don't think it is
>defective (in the broken sense) just inexpensive. And so, we need to learn
>how to minimize the effect on those photos that exagerate the problem.
>
>I have hopes of finding out how VS controls the scanner differently and 
>then
>being able to make adjustments to the scanning when needed to reduce this.
>
>More to come..
>
>
>/fn
>
>-----Original Message-----
>From: owner-filmscanners@halftone.co.uk
>[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Lynn Allen
>Sent: Friday, July 06, 2001 11:19 AM
>To: filmscanners@halftone.co.uk
>Subject: RE: filmscanners: Stains and Grains (was Yellow Stain)
>
>
>Frank wrote:
>
> >The light source is a single small light tube (3/16" x 2 1/2" about) and 
>it
> >is masked off via a slot so only the center 1 inch or so is used to
> >illuminate the film.
>
>So you're saying, Frank, that the light source and the CCD array are
>traveling in tandem--do I understand it so far? If this is the case, could
>the problem be that the elements are not traversing *far* enough to make a
>fully-lighted and/or fully sensed scan?  The problem remains: a "hot" 
>center
>and a slightly "cooler" periphery, in what would appear to be Kelvins. That
>still sounds like a light problem--although I couldn't venture as to 
>exactly
>what's happening. And I can't visualize how the sensor array is arranged, 
>or
>how far it travels.
>
>I'll admit that I have neither the technical know-how nor the intestinal
>fortitude to take my Scanwit apart, so thanks for doing this. It's clear
>that the techs at Acer (or anywhere else, for that matter) are not going to
>volunteer the information.
>
>Best regards--LRA
>
>
> >From: "Frank Nichols" <frank@theNichols.net>
> >Reply-To: filmscanners@halftone.co.uk
> >To: <filmscanners@halftone.co.uk>
> >Subject: RE: filmscanners: Stains and Grains (was Yellow Stain)
> >Date: Fri, 6 Jul 2001 09:38:01 -0600
> >
> >Brief update:
> >
> >I decided to take my Scanwit apart last night to see what the optics look
> >like. The design is much simpler than I had imaged. The light source is a
> >single small light tube (3/16" x 2 1/2" about) and it is masked off via a
> >slot so only the center 1 inch or so is used to illuminate the film. This
> >eliminates any "spreading" lenses that I suspected would be the cause of
> >the
> >yellow stain.
> >
> >The CCD package appears to be a monolith assembly with integrated 
>focusing
> >-
> >I dont knowif it can be disassembler, so I left it alone.
> >
> >This means the problem originates within that CCD assembly - whether in
> >optics or electrical I can't say.
> >
> >Since others have also reported the yellow stain, I am now going to make
> >the
> >assuption it is inherent in the design and is not a broken unit. 
>Therefore
> >I
> >will be focusing on ways to correct the stain. Tonight I will post my 
>first
> >crude method on the website.
> >
> >(Jerry, yes I will take a shot at you car picture and send you the 
>results,
> >I may need the original - 2700 DPI image. Could you send it to my web 
>site
> >if I give you a password?)
> >
> >/fn
> >
> >-----Original Message-----
> >From: owner-filmscanners@halftone.co.uk
> >[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Oostrom, Jerry
> >Sent: Friday, July 06, 2001 12:57 AM
> >To: 'filmscanners@halftone.co.uk'
> >Subject: RE: filmscanners: Stains and Grains (was Yellow Stain)
> >
> >
> >
> >
> > > -----Original Message-----
> > > From:     Alan Tyson [SMTP:AlanTyson@bknowl.freeserve.co.uk]
> > > Sent:     Friday, July 06, 2001 5:18 AM
> > > To:       filmscanners@halftone.co.uk
> > > Subject:  Re: filmscanners: Stains and Grains (was Yellow Stain)
> > >
> >     [Oostrom, Jerry]  []
> > > So if it's only occasionally a problem, don't worry. You can
> > > got a lot of conventional prints made from your negs for the
> > > difference in cost between the Scanwit and anything else
> > > that's worth having. Some negatives have always been
> > > difficult to print. The mistake occurred at the moment the
> > > button was pressed, not when the scanner was bought.
> > >
> >     [Oostrom, Jerry]  If only it were an occasional problem for me :-(
> >
>
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