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The TV finder

A 0.5m aperture finder fitted with a television camera is available for identifying star fields and acquiring guide stars. It has two modes, which can be selected from the AAT console:

With the narrow field and a dark sky, stars down to 18th magnitude can be seen with about 10 seconds integration. Because the absolute pointing accuracy of the AAT is so good, the TV finder is rarely used as a finder telescope but some observers find it useful to watch for approaching clouds.

The off-axis mounting position of the finder means it is often vignetted by the relatively small viewing aperture of the dome and windshield. An `align-dome-to-finder' command is available from the control system to allow the finder to see the sky.

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