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Re: filmscanners: Nikon Coolscan IV Focus

Good for you that you don't have any problem with sharpness and depth of 
field problem with your scanner.
I have it on my  2 Nikon scanner.  LS 2000 and Ls 4000. .
Regards Mikael Risedal

>From: "Douglas Landrum" <dflandrum@earthlink.net>
>Reply-To: filmscanners@halftone.co.uk
>To: "Scanner List" <filmscanners@halftone.co.uk>
>Subject: filmscanners: Nikon Coolscan IV Focus
>Date: Sat, 28 Apr 2001 16:44:53 -0700
>I have posted on the list a couple of times that I find no lack of depth of
>field on the Nikon Coolscan IV - LS-40.  After seeing several posts that
>question the depth of field on the LS-4000, I decided to perform an
>experiment with the Coolscan IV and post the results found here:
>This is a comparison of the corner portion of a Kodachrome slide scanned
>using three separate focus points on my Coolscan IV using Nikon Scan 3.0
>with the Digital ICE "off".  I selected an old slide of no particular
>artistic value.  The slide shows about average curvature in the mount for
>The first image shows the corner section with the autofocus point at the
>center default.  The second image shows the results moving the autofocus
>point to the lower center of the edge.  The third image shows the autofocus
>point dead on the flower pedal in the corner enlarged.  The whole slide 
>is shown as the fourth image with the corner enlarged highlighted. The
>values of the manual focus slider in the tool pallet of Nikon Scan 3.0 were
>101, 99 and 96 respectively.
>I saw no difference in the quality of the focus with the raw scan data
>imported into Photoshop 6.0 scaled to 300%.  Any larger scaling  of the
>images showed pixels.  The JPEGs posted show what I saw at a 300% scaling 
>the raw image.  The LS-4000 may have different optics or the greater ppi of
>the LS-400 may show more critical focus but the 2900 ppi of the Coolscan IV
>does not show any focus problems to me.
>Douglas F. Landrum
>Laguna Beach, California
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