Divide your required pixel dimensions (Step 1) by the physical dimensions of the original (Step 2). The result is your scan resolution. (If you get different numbers for the width and height, use the larger and expect to do some cropping in Photoshop.)
Many flatbed scanners (scanners designed for use with documents and photos) have transparency adapters that let you scan film and slides. However, if you have a lot of negatives or slides to scan or if the best possible quality is required, consider a dedicated film scanner from Nikon, Minolta, or Kodak.
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