Plate scale on Magellan at f/10 is 0.108" per unbinned 10 micron pixel. That's for a focal length of 6.5*11=71.526 meters.
| telescope | diameter (m) | f-number | focal length | plate scale. |
|---|---|---|---|---|
| Magellan, Nasmyth | 6.5 | 11 | 71.526m | 0.108"/pix |
| Keck, Nasmyth | 10 | 15 | 149.6 | |
| SOAR, 14' field Nasmyth | 4.3 | 16.6 | 68.17 | |
| VLT Nasmyth | 8 | 15 | ||
| Gemini, bent cass | 8.1 | 16 | ||
| Apache Point, Nasmyth | 3.5 | 10 | 35 | |
| Wm Herschel Telescope, Nasmyth | 4.2 | 11 | ||
| CTIO Cass focus | 4.0 | 7.8 | ||
| ESO NTT, Nasmyth | 3.6 | 11 | ||
| ESO 3.6 m, Cass X | 3.6 | 8 | ||
| ESO 2.2 m Cass X | 2.2 | |||
| ANU 2.3 meter, Nasmyth | 2.3 | 18 | ||
| Nordic 2.6m, Cass focus OK? | 2.5 | 11 | ||