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Introduction

On the INT Prime Focus and JKT Cassegrain focus we have filter wheels installed to mount filters in front of the CCD camera. Basically 2 inch square filters can be accommodated; we have purchased certain broad band and narrow band filters for common use. Table 1 gives a list of all available filters. Figure 1 shows details of filter wheel mounting and mechanical dimensions; up to 6 filters can be mounted at one time.