I've been kinda satisfied with what I get out of my Epson
V4990 scanner. It's good enough for a quick view but I've got
the idea that I might try to print a couple of views and
wanted better (sharper) scans.

I did some quick focus tests on my scanner and think its
sweet spot is about .51mm above the glass. I arrived at this
number by scanning an angled razor blade, studying the
resulting image and picking the area of maximum sharpness. I
then measured the distance of this sharpness zone from the
end of the blade and used the known-elevation and a little
geometry to arrive at .51mm.

The 120 film frame provided by Epson places the film 1.1mm
above the glass. I arrived at this number by using my
micrometer on the lip of plastic on which the film would be
riding while being scanned.

Based on these quick measurements, I don't see any way I can
get the best out of my scanner with the provided film frame.

Are the products from www.betterscanning.com the best way to
correct this mismatch in focus?

Is my technique for determining optimum scanner focus flawed?
--
________________________________________
John Thurston
Juneau, Alaska
http://stereo.thurstons.us

>
> I use the betterscanning holders and I endorse them without
> reservation. You adjust the nylon screws until your image is in
> focus. I used an image with a sign in the background and adjusted
> until the letters were sharpest.

> I'm happy with my V750, but I think the 4990 may be a superior
> scanner.