From http://www.kenrockwell.com./tech/full-frame-advantage.htm
Here are the pixel pitches and Nyquist limiting resolutions of today's popular cameras:
| Pixel pitch, pixels per mm | Limiting Nyquist Resolution, cycles per mm |
Nikon D1, D1H | 85 | 43 |
Nikon D3 | 118 | 59 |
Nikon D40 | 127 | 63 |
Nikon D200, D80 | 164 | 82 |
Nikon D300 | 182 | 91 |
Canon 5D | 122 | 61 |
Canon 1D Mk III | 138 | 69 |
Canon 20D, 30D, XTi, 1DS Mk III | 156 | 78 |
Canon 40D | 175 | 88 |
Typical 8MP 1/2.5" CCD compact (Casio EX-V8) | 544 | 272 |
6MP Compact (Canon SD700) | 469 | 235 |