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The large-diameter fibre feed was tested at all stages of its fabrication, primarily for focal-ratio degradation and wide-band absolute throughput. The FRD performance of the finished feed is excellent, with 95 percent of the output flux contained within the input focal ratio of f/2.8. Laboratory tests of end-to-end throughput averaged over a bundle gave results in the range 70 to 80 percent at 5440Å, the variation arising principally in the connectors. Minimum connector loss is 6 percent. Data exist to confirm these values from the Autofib commissioning run; they are currently being reduced.

Tue Aug 15 16:42:46 BST 1995