--- On Tue, 9/22/09, Derek Morton <[email protected]> wrote:
<clip>
> A really excellent (but pricey) choice is 3M acrylic foam
> core double sided acrylic adhesive tape:
That's too thick. The focal point of scanners is the top side of the glass.
Anything thicker than the original double sided tape will move the glass down
and out of the focus.
Some scanners have quite a bit of field depth, some are precisely focused on
the top of the glass and anything not touching the glass will scan blurry.
In my experience, the thicker the scanner, the greater its depth of field.
There are exceptions of course! The scanners in many Brother multifunction
units have zero depth of field. If it's not in direct contact with the top of
the glass it'll scan blurry.
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