Table 5
CRISP2 Strehl values.
| λ x |
(nm) y |
530 | 550 | 600 | 650 | 700 | 750 | 800 | 850 |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0.99 | 0.98 | 0.97 | 0.95 | 0.95 | 0.94 | 0.95 | 0.96 |
| 0 | 60″ | 0.96 | 0.96 | 0.97 | 0.98 | 0.98 | 0.98 | 0.98 | 0.98 |
| 0 | −60″ | 0.96 | 0.96 | 0.97 | 0.98 | 0.98 | 0.99 | 0.98 | 0.98 |
| 60″ | 0 | 0.98 | 0.97 | 0.97 | 0.97 | 0.97 | 0.96 | 0.96 | 0.95 |
| −60″ | 0 | 0.94 | 0.95 | 0.98 | 0.99 | 0.99 | 1.00 | 0.99 | 0.99 |
| 0 | 70″ | 0.92 | 0.93 | 0.94 | 0.95 | 0.96 | 0.97 | 0.97 | 0.96 |
| 0 | −70″ | 0.93 | 0.93 | 0.94 | 0.96 | 0.97 | 0.97 | 0.97 | 0.96 |
| 70″ | 0 | 0.97 | 0.97 | 0.96 | 0.96 | 0.96 | 0.95 | 0.95 | 0.94 |
| −70″ | 0 | 0.88 | 0.91 | 0.94 | 0.97 | 0.98 | 0.99 | 0.99 | 0.98 |
Notes. CRISP2 Strehl values at different x and y offsets in arcsec from the centre of the FOV, and wavelengths, at a fixed focal plane. With the large FOV of CRISP2, the tilt of the SST focal plane is noticeable and is compensated for by tilting the focal plane of the CRISP2 cameras by 1.6°. The reduced Strehl in the outermost parts of the FOV at short wavelengths is acceptable since CRISP2 primarily targets observations at longer wavelengths.
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