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Table 1
Stray-light levels for the VTT/POLIS in various studies.
| Measurement | Wavelength | Stray-light level |
| Pupil plane (PCO) | 557 nm | 4% (~1–2% tail) |
|
|
||
| POLIS (this work) | ||
| F1 blocked | 396 nm | ~1–2% (tail) |
| F2 blocked | 396 nm | ~1–2% (tail) |
| Limb | 396 nm | ~1–2% (tail) |
| Blocked behind grating | 396 nm | ~5% |
| Blocked behind grating | 630 nm | ≪1% |
| Convolution of FTS | 630/396 nm | 20% |
|
|
||
| POLIS (other studies) | ||
| Umbral profile1 | 396 nm | ~12% |
| Room light1 | 396 nm | <1% |
| Convolution of FTS2 | 630 nm | 15% |
| Umbral profile3 | 630 nm | ~10% |
| Parasitic light correction4 | 630 nm | ~4% |
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