Digital BW, The Print

At 10:14 AM 1/9/04 +0200, you wrote:
>I made a similar test by placing a ruler on the glass and raising the other
>end of the ruler to find the optimal focal plane with a 2450 scanner. The
>focal plane was very close to 2 mm (3/32").
>I'm now scanning my 4x5 negs with a 1680 Pro scanner. With that scanner you
>can choose between two focal planes, i.e. 0 and 2 mm (3/32"). I lay the
>negative emulsion side down on the glass and keep it flat with an antinewton
>treated piece of glass on top.
>Martin Glader
>
>----- Original Message -----
>From: "Mark Hahn" <markhahn2000@...>
>To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
>Sent: Friday, January 09, 2004 8:48 AM
>Subject: [Digital BW] Epson 2450 - negs on glass [was:Re: Scanning Tri-X]
>
>
>here's and article showing why your probably *don't* want to lay your
>negatives on the glass:
>
>http://www.normankoren.com/Tutorials/Epson_flatbeds.html#Focus_spacing
>
>(see Focus and Spacing)
>
>This made a big difference in the quality I get out of the scanner.
>
>mark
>
>...
> > > Do you really just lay the negatives down on the scanner?  Not in
>the
> > > holder?  wowo.  How do you keep the negatives flat?  I would like
>to
> > > try that on my 2450 but I didn't think it possible...
>...



Guys,
I think the problem is that each scanner has a "sweet" spot. However, the 
depth of focus is deep and overcomes serious differences.  I did tests with 
the 2400 by stacking sheets of AN slide glass under the film. I could not 
see differences between flat on the glass to three layers of slide glass. 
The advantage of AN neg holder is of course the elimination of film 
warp.  Another consideration is operator skill - deciding how and when in 
the work flow to sharpen.
I have a  E2400 scanner test page here: 
http://www.panoramacamera.us/m_2450test.html
I have the 3200 scanner now and think it's terrific - a new model is due 
out this Spring with 4200(?) dpi.

AZ



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