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 [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED], Israel Shapiro
[EMAIL PROTECTED]
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 * [EMAIL PROTECTED] * http://billfernandez.com
==
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