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These filters have been constructed at RGO from various cemented combinations of Schott glass. R W Argyle specified the combinations which are similar to those in use at the AAT, SAAO and elsewhere. Table 2 shows details of these filters. Three sets exist; one for the INT, one for the JKT and one at Cambridge.
The WG280 is used to give uniform thickness of all filters. For Z, and to some extent I, the longwave cutoff is determined by the CCD response.