More important than raw scan speed, however, is that both the driver and hardware design help make scanning quick and easy. Scanning a slide at 2,400 ppi took 1 minute 8 seconds. We timed the 3940 at 29 to 33 seconds for prescanning and scanning a 4-by-6 photo at a number of resolutions. Fortunately, the results using the default settings for most slides should be acceptable to most casual photographers, if not serious hobbyists. The 3490 still did a credible job with film, especially on less demanding slides, but adjusting settings to get the most from each image required more work than with the Canon printers-something more than a point-and-shoot photographer would probably want to do. On one of our toughest test slides, which had a dark line of trees against a bright sky, the 3490 lost more detail in the tree line than either the CanoScan 8400F or the 9950F. Scan quality for film is highly dependent on dynamic range-the ability to see all the steps in shading across the entire range from black to white. High resolution isn't all that's needed for scanning slides, however. At 2,400 ppi, detail and sharpness were roughly equivalent to 2,400-ppi scans from the 8400F, although not a match for the more expensive Canon CanoScan 9950F, which is also a current Editors' Choice. The 3940 also did a reasonably good job resolving detail in slide scans.
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