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Table 2.
Optical design parameters.
| FOV | 40° ×40°, limited to Ø48° |
| in the detector corners | |
| Number of lenses | 5 elements |
| Aperture | 16 mm × 16 mm square with |
| rounded corners Ø19 mm | |
| Imaging area (measured) | 38.84 mm transverse |
| ×40.12 mm radial | |
| Focal length (theoretical) | 55.9 mm |
| Plate scale (theoretical) | 0.971 mm deg−1 at 0° field; |
| 1.082 mm deg−1 at 20° field | |
| F/# (theoretical) | 3.48 |
| Spectral range (measured) | 500 nm–850 nm |
| Resolution (measured) | 1.3′[arcmin], |
| at full detector resolution. | |
| Boresight/nominal pointing | 25° elongation from Sun centre |
| Inner FOV cutoff (measured) | 5.4° fully vignetted; |
| 9.30° fully unvignetted |
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