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The IFU field spectrograph for the Wendelstein 2-m Telescope (VIRUS-W)
(on loan at the 2.7-m telescope of the McDonald Observatory, Texas)
| | medium resolution mode | low resolution mode |
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| Field of view | 267 fibers within 150″ × 75″ | 267 fibers within 150″ × 75″ |
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| Fiber size | 150 μm | 150 μm |
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| Dispersion element | volume-phase grating 3300 ll/mm and prisms | volume-phase grating 1900 ll/mm |
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| Resolution R | 6800 | 2500 |
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| Resolution sigma | ~18 km/s | ~25 km/s |
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| Spectra coverage | 493–545 nm | 475–560 nm |
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| Detector | e2v 2k×4k 15 μm | e2v 2k×4k 15 μm |
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