  The Flamingos-2 Tandem Tunable filter is a tunable, narrow-band filter,
consisting of two Fabry-Perot etalons in series, capable of scanning to any
wavelength from 0.95 to 1.35 microns with a spectral resolution of R~800. It is
an accessory mode instrument for the near-IR Flamingos-2 imaging-spectrograph
designed for the Gemini South 8m Observatory and will be fed through the
upcoming Multi-Conjugate Adaptive Optics feed. The primary science goal of the
F2T2 filter is to perform a ground-based search for the first star forming
regions in the universe at redshifts of 7 < z < 11. The construction of the
F2T2 filter is complete and it is currently in its calibration and
commissioning phases. In this proceeding, we describe the calibration and
performance of the instrument.
