Drum scanners offer the best resolution and sharpness out of any type. Different to a flatbed scanner, they offer auto and manual focus capabilities, as well as an adjustable aperture. Controlling the size of the aperture directly affects how apparent the grain is in the scan, while still retaining all the detail. With these features, you can be sure your scans will be as sharp as the original.
Example 1: 6x6 Fuji Velvia 50, 4k dpi, 100% Crop
Epson Flatbed - Scanned at 6400 dpi, no sharpening - click on image to see full size
Although the Epson claims an optical resolution of 6400 dpi, it's clear that the image is lacking sharpness. Look closely at the rails on the top floor balcony, they're barely visible in the flatbed scan.
Drum Scan - Howtek 4500 - Scanned at 4000 dpi, no sharpening - click on image to see full size
Notice the much clearer rails on the balcony, as well as the foliage in the foreground. What you’re seeing is not scanner noise, it is actually the grain of the film.
Example 2: 4x5” Ektar 100, 4k dpi
Howtek 4500 - Ektar 100 4x5”, 4k dpi
See magnifications below:
Howtek 4500 - Ektar 100 4x5”, 4k dpi @ 100%