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Throughput

The theoretical and measured throughput of TAURUS--2 with the f/2.1 camera is shown in Fig ?. The throughput is between 55 and 70 per cent over the wavelength region from 4000 Å to 1 micron.

This figure excludes the filters and etalons used with TAURUS--2. Efficiency curves for the broadband BVRI filters used with TAURUS are given in La Palma Technical Note 73. Efficiency curves for the interference filters used with TAURUS are given in La Palma Technical Note 75. The peak transmission of each interference filter is summarised in Table 12. A typical value is 60 per cent.

When TAURUS is used in Fabry-Perot mode, an efficiency for the etalon of between 70 and 90 per cent can be assumed.