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Up: The Cassegrain A&G Box
Next: Object acquisition
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The layout of the A&G Unit is shown in Figure 1. It is described in some detail by P.A. Ellis in ING La Palma Technical Note no. 56. Briefly, the unit has a full field of 15 arcmin diameter at the nominal telescope focus, 150 mm below the A&G to instrument interface. Facilities are provided to view the on-axis field, either directly or reflected from the ISIS slit jaws, autoguide using the off-axis field, take calibration exposures, use colour or neutral density filters and image by deflecting the on axis field to the auxiliary port.
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