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Table 1
Parameters of the Zerodur DSMs for MMT, LBT and VLT.
| Telescope | MMT | LBT | VLT |
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| Shape | Convex asph | Concave asph | Convex asph |
| Roc [mm] | 1795.0 | 1974.2 | 4553.6 |
| Conic constant | –1.409 | –0.7328 | –1.66926 |
| Diameter [mm] | 642 | 911 | 1120 |
| Thickness [mm] | 2 | 1.6 | 2 |
| N actuators | 336 | 672 | 1170 |
Notes. Roc = Radius of curvature.
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