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Pupil plane filter wheel

This has 8 positions, each of which can hold a circular filter up to 76 mm in diameter. Filters with a smaller diameter than the collimated beam (about 68 mm) will cause vignetting. The filters available for use with TAURUS-2 are listed in viii.

Position 1 of the pupil plane filter wheel is a large hole, used to gain access to the etalon wheel when changing etalons; this position cannot be used for filters,

Thu Apr 7 00:29:52 BST 1994