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Narrow band filters

At present, we have 31 narrow band filters, mostly of 50Å bandwidth, comprising a set of emission line filters and a set of redshifted H redshifted filters. Only one set exists and therefore the filters are shared between the telescopes. These filters were specified for a focal ratio of 4.5 which explains the difference in wavelength between the actual peak wavelength and the required peak wavelength. The original specification for the emission line filters is given below:

Tue Aug 15 16:42:46 BST 1995