We present an overview of SITELLE , an Imaging Fourier Transform Spectrometer ( iFTS ) available at the 3.6-meter Canada-France-Hawaii Telescope .
SITELLE is a Michelson-type interferometer able to reconstruct the spectrum of every light source within its 11 ^ { \prime } field of view in filter-selected bands of the visible ( 350 to 900 nm ) .
The spectral resolution can be adjusted up to R = 10 000 and the spatial resolution is seeing-limited and sampled at 0.32 ^ { \prime \prime } per pixel .
We describe the design of the instrument as well as the data reduction and analysis process .
To illustrate SITELLE ’ s capabilities , we present some of the data obtained during and since the August 2015 commissioning run .
In particular , we demonstrate its ability to separate the components of the [ OII ] \lambda \lambda 3726,29 doublet in Orion and to reach R = 9500 around H \alpha ; to detect diffuse emission at a level of 4 \times 10 ^ { -17 } erg cm ^ { -2 } s ^ { -1 } arcsec ^ { -2 } ; to obtain integrated spectra of stellar absorption lines in galaxies despite the well-known multiplex disadvantage of the iFTS ; and to detect emission-line galaxies at different redshifts .