Jan,
When you say "plate", are you talking the glass on flat bed scanners? Some scanners don't use a plate. I believe the high quality Nikon scanners are that way and I just purchased a Plustek 7600 that doesn't use a plate.It scans directly to a CMOS chip the same way that a digital camera does. The Plustek uses an LED light source. That is one of the reasons that I bought it and I have had excellent results for my purposes. Supposedly, it can scan up to 7600 dpi. I usually scan 300 dpi to an 8x10 target in TIFF format for archive purposes. I also produce a JPEG for everyday use. I am using Vuescan software, but the unit comes with Silverfast which to me is more difficult to use. I am planning to upgrade the Vuescan software so that I can archive photos in RAW format.
Bill Barber Gravois Mills, MO Fri Apr 20, 2012 7:38 pm (PDT)
As a photographer and photograph restorer, there is actually a
very good reason why they do that.
No matter what type scanner you use, not scanning the
negative/slide directly against the plate can cause diffusion
of the image. It doesn't matter how new or good your scanner
is, the reason is the laws of optics: a negative or slide
scanned directly against the plate will always be sharper
than those that are not.
Cheers!
Jan Kohl
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