Imaging with TAURUS-2

TAURUS-2 is described in more detail in Section . There is a choice of either an f/2.11 or an f/3.96 camera in TAURUS-2, giving a scale and field-size summarised in Table . Please note that TAURUS-2 was not designed to do high speed photometry, and so a fast shutter is not available for timing exposures. In general exposure times of <10 sec should be avoided. This can be especially important to bear in mind when selecting standard stars.

In addition to the facilities provided by the Cassegrain A&G unit described in Section , the following are provided:

• Filters. There are two filter wheels in TAURUS-2, at the telescope focus and in the collimated beam.

  The wheel in the focal plane of the telescope takes up to 8 filters, each of which can be up to 125 mm in diameter. Note that small filters placed in the telescope focal plane may restrict the field of view, and in particular the 50 mm square filters, which are standard on the INT and JKT, will restrict the field available with TAURUS-2 to less than 3.76 arcmin.

  The focal plane filter wheel is tiltable, allowing the central wavelength of the filter to be varied (see Section .

  The filter wheel in the collimated beam takes up to 8 filters, each of which can be up to 76 mm in diameter. Note that the diameter of the collimated beam is about 68 mm (see Section ), so that filters smaller than this will cause vignetting when placed in the collimated beam. In particular, this will be the case for the 50 mm square filters used on the INT and JKT.

  Appendix summarises the larger filters available specifically for TAURUS-2 observations.

• CCD detector. The available detectors are summarised in Table .