The problem with the "triangles" are these:
- Your flatbed scanner has a limited optical resolution. A slide is
25 mm wide; if you scan that at 600 dpi, this is equivalent of
scanning a full page (A4 or Letter format) at 75 dpi.
So you will not see fine details of the slide!
- If you have framed slides, they will not be lying flat on the
scanning glass, and hence be slightly out of focus.
- The light distribution within the "triangle" is not perfect.
Much depends on what you want to use the scans for: If you merely
want to have a few gifs for your home page, the triangle is OK.
But for quality output, for making prints, or for archiving you
want to have at least 2400 dpi resolution.
You can purchase a film scanner (HP, Canon, Nikon) or a flatbed
scanner with a slide tray (or at least a changeable optic system)
(Umax?).
I tried the "triangle" and finally settled for the Canon film scanner.
Ulrich Deiters
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