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[filmscanners] Re: Black and white scans onLS4000EDandotherissues

"Tony Terlecki" <ajt@mrps.demon.co.uk> suggests:
An easy test is to manually focus on a specific part of the film and scan.
That will give you an image critically focused on that point. Then in
NikonScan manually adjust the "Manual Focus Adjustment" number setting in
increments of +/- 5 then rescan. At a deviation of about 10 from critical
focus you should have noticeable softening of the image. Your own comfort
levels will vary but you can, by using multiple point focus sampling,
determine whether the film is flat enough for a sharp scan across the
entire image.

Dunno about the 4000, but with the 8000ED, an unmounted 645 slide that looks
flat in the (non-glass) holder measures a focus range of about 0.1 units
with Vuescan. A focus error of 0.05 units is no problem, but an error of 0.1
is beginning to be a problem. So I take a few readings across the frame and
pick the middle of the range. Fortunately, taking a focus reading with
VueScan is quite quick.

David J. Littleboy
Tokyo, Japan

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