http://www.normankoren.com/Tutorials/MTF.htmlTable of contents for the image sharpness series
Part 1: Introduction
Introduction to modulation transfer function (MTF)
Definition | Virtual chart | MTF data and other links
Human visual acuity
Part 1A: Film and Lenses Part 2: Scanners and sharpening
4000 vs. 8000 dpi scans
Part 3: Printers and prints
Part 4: Epson 1270 results
Part 5: Lens testing
Part 6: Depth of field and diffraction
Digital cameras vs. film, part 1 | part 2
Part 8: Grain and sharpness: comparisons