Table 1.
Nominal characteristics of the FSI telescope.
| Optical element | Parameters |
|---|---|
| Entrance pupil | Hexagonal, 2.75 mm edge |
| Occulting disc (OD) | Circular, 8.87 mm |
| Length Pupil-OD | 135.9 mm |
| Mirror (M1) | |
| Figure | Concave ellipsoid (K = −0.732) |
| Dimensions | 66 mm × 66 mm substrate |
| 53 mm × 53 mm useful area | |
| Off-axis | 70 mm |
| Radius of curvature | 925 mm |
| pass-bands | 17.4 nm and 30.4 nm |
| Pupil – M1 centre | 737.35 mm |
| M1 – Focus | 459.4 mm along optical axis |
| Filter wheel | Redundant Al/Zr/Al and Al/Mg/Al |
| Detector | Flat, 3072 × 3072 10 μm pixels |
| Tilt to optical axis | 6.82° |
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