Re: Canon FS4000US focus
- From: DenverDad <the_applegates@xxxxxxxxxxx>
- Date: 14 May 2007 09:14:14 -0700
Brian,
I can report that my FS4000 has always focused well, as have those of
others I have talked with on here. If anything, the focusing ability
of this scanner is considered one of its strengths since (at least by
some accounts) it has greater depth of focus than some of the other
brands. Hopefully, focus deficit you are seeing is just the result of
software settings, as opposed to a hardware problem - which obviously
would be a more $eriou$ problem.
The first thing I can suggest is to see what VueScan settings you are
using for focus. I don't have the software in front of me at the
moment, but as I recall the settings for focus are all under the Input
tab. Make sure that you are set to autofocus as opposed to manual
focus; then check which particular autofocus setting you are using.
As I recall you can select to focus during the preview only, during
the scan only, or always (other settings?). It is probably best to
select "always" so that there is no doubt that the scanner will try to
find best focus each time. The next thing to check is where in the
frame the scanner is measuring focus. You may be aware of this
already, but there is a small "+" symbol which appears in the preview
scan. This is the location in the frame where the focusing routine
measures to find best focus. Since there is always at least a little
bowing of the film in its holder, it is important to set the mark to
an appropriate location. Make sure that it is NOT placed near the
edge of the frame (or worse yet, out of the frame). Rather than
placing this mark right in the center of the frame, I find that it is
usually best to place it somewhat away from the center - say half way
between the center and an edge. This makes best use of the depth of
field of the scanner optics and usually insures that the entire frame
will be in sharp focus. You should be careful that this mark falls on
an area which has high contrast and is not too dark. Otherwise the
scanner may not have enough to work with in determining the best
focus.
If all these software settings seem right, the next thing you might
want to try is to perform a manual focus test. Without the software
in front of me I don't remember exactly how you go about selecting
manual focus. But once you have it selected, perform a number of
scans varying the focus depth over some range. You should see that
there is an optimum depth at which the scans appear well focused, with
the scans being blurrier on either side of this. If the scanner's
focus mechanism is not working (or if the software is not accessing it
properly) these scans will probably all appear to have the same degree
of focus (i.e., equally blurry). On the other hand, if you can
clearly see that there is a best focus but the best scan is STILL not
acceptably sharp, then it may indicate an optics problem in the
scanner.
Finally, Steven's suggestion to try FilmGet is a good one. You could
also try a different version of VueScan to make sure that this isn't
just a bug with that particular version.
Anyway, that's all I have for you at the moment. Let us know if any
of this helps!
Good luck,
Jeff
.
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