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Two filter slides, situated below the autoguider
assembly, provide colour and ND filtering. Each slide carries
five filters in cells,
and the cells all carry discrete bar coding for filter identification.
The filter cell carrier may be removed and alternative cells fitted.
The filters have a maximum diameter of 85 mm.
The name of the filter mounted in each position may be determined
using a barcode reader. The filters available are listed in
Table 3,
together with their barcodes.
