VLT-MAN-ESO-14650-4942
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24.06.2015
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2.2.1.2 The Acquisition and Guiding slide
Light coming either directly from the telescope or from the Calibration Unit described above
reaches first the A&G slide. This structure allows putting into the beam either:
a flat 45˚ mirror with 3 positions mirror:
o acquisition and imaging: send the full 1.5’1.5’ field of view to the A&G
camera. This is the position used during all acquisition sequences;
o spectroscopic observations and monitoring: a slot lets the central 10”15” of
the field go through to the spectrographs while reflecting the peripheral field to
the A&G camera. This is the position used for all science observations.
o artificial star: a 0.5” pinhole used for optical alignment and engineering
purposes;
the IFU (described in Sect. 2.2.1.3);
a 50/50 pellicle beam splitter at 45˚ which is to used look down into the instrument
with the A&G camera and is exclusively used for engineering purposes.
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