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Table 5
Comparison of integration times tint required by each of the spectropolarimeters discussed above, and of ESO FORS, to reach σ⟨ Bz ⟩ = 500 G for an observation of a DA3 star of V = 12.5.
| Spectropolarimeter | texp |
| (s) | |
|
|
|
| CFHT ESPaDOnS Hα | 1500 |
| SAO MSS R15000 Hβ | 19 200 |
| WHT ISIS blue arm R600B grating | 7400 |
| ESO FORS grism 600B, 3470–5890 Å | 1950 |
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