[Fwd: Re: Medium format scanners]
[Fwd: Re: Medium format scanners]
- Subject: [Fwd: Re: Medium format scanners]
- From: Ernst Dinkla <email@hidden>
- Date: Fri, 28 Oct 2005 10:27:03 +0200
Marco Ugolini wrote:
In a message dated Thursday, October 27, 2005 1:28 AM, David Scharf wrote:
The 4990 has a 4800 ppi optical resolution, not 2400. For $599 with
SilverFast Ai software, its one of the best deals out there (for my
purposes anyway). If your scanning 35mm, get a dedicated scanner. If its
127, 120, 6x9, 4x5, up to 8x10, this is a great little scanner. Talking
about negs and transparencies here.
I have an Epson Perfection 3200 Photo flatbed scanner (yes, a bit old...any
day now the big money will come and I will upgrade!), and when I use it to
scan transparencies and negatives using Epson's holders, I find that the
lighting is very uneven. And also, the scans are terribly unsharp. Both of
which things make it useless for me.
Is the lighting nice and even in the 4990? And is it sharp?
Thank you.
--------------
Marco Ugolini
Mill Valley, CA
The 3200 has a lighting system that's static and covers a wide
area. The 4870/4990 have another lighting system that runs
along with the sensor and by that gives off less heat.
The 3200 lighting system is not that uneven but there are
other issues that make the scan uneven lightened. The only way
I could solve that was by wet mounting to an extra float glass
sheet, place that glass sheet with the film clinging under it
on a mask on the scanner glassbed. The glass sheet protects
the film from the heat building under the lamphouse. and keeps
the film totally flat. Masking anything but the film window
and the initialising strip is recommended too. That takes 90%
of the uneven lighting away. My 3200 has its best focus
distance at 1.7 mm above the glassbed. It should be at 1 mm
but there's variation in the production. See Norman Koren's
pages on that subject.
The scanner's multisampling + bigger wells being 3x the
sampling pitch + a lens system that has no active focusing but
relies on DOF asks for lots of sharpening. Normal for a
concept like that. Apply it and check for artifacts.
Related messages including a link to some MTF tests on MF and
flatbed scanners:
http://hardware.mcse.ms/message104323-2.html
The 3200 isn't that bad compared to 4870/4990 and the Nikon
8000. But the 4990 sure is a much better package in total.
--
Ernst Dinkla
www.pigment-print.com
( unvollendet )
--
--
Ernst Dinkla
www.pigment-print.com
( unvollendet )
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