  The Taurus Tunable Filter (TTF) has now been in regular use for seven years
on the Anglo-Australian Telescope. The instrument was also used for three years
(1996--1999) on the William Herschel Telescope. We present a brief review of
the different applications in order to illustrate the versatility of tunable
filters in optical/IR spectrophotometric imaging. Tunable filters are now
planned or are under development for 6-10m class telescopes which ensures their
use for years to come.
