Originally Posted by
Heroique
Just a clarification...
The 4990 has a single fixed lens.
Its successors, the v700/v750 series, have two lenses.
If you determine the optimal scanning height above the 4990's platen and use a film holder (e.g., either homemade or the "BetterScanning" holder), its greatest effective resolution falls in the range of 1500-1800 dpi or so, maybe a little better if you have a great sample.
For 8x10 film, you might meet your printing needs with less resolution than that.
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Notes on homemade holder:
An inexpensive and effective alternative to Epson/BetterScanning holders is to simply use a piece of store-bought, anti-glare glass (not anti-reflection glass), and use six or eight pieces of artist’s tape to tape your film on the side with the etched surface. This eliminates Newton rings. You’d flip the glass so the film faces the scanner bed. You can use various things to support and adjust the height of the glass above the bed – for example, post-it note pads. The ideal height is different from scanner to scanner, typically in the realm of 2mm or 3mm, but conveniently, the scanner lens provides a healthy amount of DOF.
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