| Sinnott's Diffraction Limited Field of Width per Sky & Telescope May, 1991:528-531 at 531 | ||||
|---|---|---|---|---|
| F_ratio | width_in | width_mm | %_1.25inFOV | %_2inFOV |
| 4 | 0.04 | 1 | 3 | 2 |
| 4.5 | 0.06 | 1 | 5 | 3 |
| 5 | 0.08 | 2 | 6 | 4 |
| 5.5 | 0.11 | 2 | 9 | 5 |
| 6 | 0.15 | 3 | 12 | 7 |
| 6.5 | 0.19 | 4 | 15 | 9 |
| 7 | 0.24 | 6 | 19 | 12 |
| 7.5 | 0.29 | 7 | 23 | 14 |
| 8 | 0.35 | 9 | 28 | 17 |
| 8.5 | 0.42 | 10 | 34 | 21 |
| 9 | 0.51 | 12 | 40 | 25 |
| 9.5 | 0.6 | 15 | 48 | 30 |
| 10 | 0.7 | 17 | 55 | 35 |
