Available aperture masks:
| 1 | big hole | for direct imaging and 2-shuffle |
| 2 | matrix | for focussing, astrometry, ghost mapping |
| 3 | 80-shuffle slit | for shuffle arcs |
| 4a, 4b, 4c, 4d | VPH slits (50um, 100um, 150um, 250um) | for grism spectroscopy |
| 5 | slot ("fat slit") | for time series imaging, polarimetry |
| 6 | 5-shuffle | 5-shuffle imaging, telescope focus, flux standards |
| 7 | 4-shuffle | 4-shuffle imaging |
| 8 | 3-shuffle | 3-shuffle imaging |
| 9 | spot | automated camera focus |
| 10a, 10b | time series, supershuffle | for time series imaging, multi-order arcs, plate parallelism
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