Its not only old slides as mention below, all negative or positive film who
are litle bit curved show the same problem with overall sharpness regarding
LS2000 and LS 4000.
The problem is lack of depth of field in the lens construction .
Mikael Risedal
>From: Bill Fernandez <bill_sub@billfernandez.com>
>Reply-To: filmscanners@halftone.co.uk
>To: filmscanners@halftone.co.uk
>CC: <filmscanners@halftone.co.uk>, "Israel Shapiro"
><israel.shapiro@fire-media.com>
>Subject: RE: filmscanners: Canon's scanner
>Date: Wed, 3 Oct 2001 15:11:31 -0600
>
>At 8:15 PM +0200 3-10-01, Alex Z wrote:
>>I've heard and read in various reviews about LS4000ED's focusing
>>problems at the frame edges...can you confirm that ?
>
>BF: Yes. Many of my slides are 20 year old Kodachromes with visible
>curvature. Some (but not all) have a pronounced depth of focus
>problem. It's easy to test: NikonScan has a focus-point tool that
>lets you click anywhere on the preview image to make the scanner
>focus on that point. If you set your preferences to auto-focus
>whenever you set a new focus point you can see the numerical value of
>the manual focus slider change each time it auto-focuses. On a
>problem slide all you have to do is set the focus point on the center
>and do a scan then set it on an edge or corner and do a scan. The
>results are crystal clear: the scan is sharp where you set the focus
>point (e.g. in the corner) and fuzzy at other places (e.g. in the
>center).
>
>>It would be interesting to compare dynamic ranges of FS4000US and SS4000
>>though...
>
>BF: The shadow detail (and by implication the dynamic range) on the
>Polariod was noticeably better.
>--
>
>======================================================================
>Bill Fernandez * User Interface Architect * Bill Fernandez Design
>
>(505) 346-3080 * bill@billfernandez.com *
>======================================================================
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