  The Taurus Tunable Filter (TTF) is a tunable narrowband interference filter
covering wavelengths from 6300 A to the sensitivity drop-off of conventional
CCDs (9600 A), although a blue `arm' (3700-6500 A) is to be added by the end of
1997. The TTF offers monochromatic imaging at the cassegrain foci of both the
Anglo-Australian and William Herschel Telescopes, with an adjustable passband
of between 6 and 60 A. In addition, frequency switching with the TTF can be
synchronized to movement of charge (charge shuffling) on the CCD which has many
important applications in astrophysics. Here we review different modes of TTF.
We maintain a web site at http://msowww.anu.edu.au/~dhj/ttf.html describing all
aspects of TTF and its operation. In addition to general use, the instrument is
available in AAT service time. Details can be found at
http://www.aao.gov.au/local/www/jmc/service/service.html.
