Epson Perfection 640U Series Manual - Halaman 7

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Halaman Cetak
Epson Perfection 640U Series Manual
Image Quality—Dual Lens System
A unique Dual Lens System, available on some Epson
scanners, automatically selects from two lenses for
the desired scan resolution.
High Resolution lens
Some Epson Perfection scanners
offers 4800 dpi optical resolution
with the High Resolution lens.
Super Resolution lens
For a higher resolution of 6400 dpi,
the Super Resolution Lens can scan
slides and film with the bundled film
holders with a scanning width of 5.9
inches.
Image Quality—High-Pass Optics
Epson High Pass Optics includes anti-reflection optical coatings and a high reflection mirror.
There is typically a small percentage of unwanted reflection with standard CCD glass which can
cause abnormal ghost images. The anti-reflection optical coating on the CCD cover glass minimizes
this reflection and reduces ghost images.
With a higher reflection rate, film scanning speed is faster.
Ghost image
Scanner Technical Brief—Page 7
Scanned with normal CCD glass
Dual Lens System offers
two lenses for two
different resolutions.
Document (8.5")
Film Area Guide (8")
Film Holder (5.9")
Improved
image quality
High resolution lens
Super resolution lens
Scanned with anti-reflection
optical coating
6/07