  Synoptic full-disk solar telescope are fundamental instruments for present
and future Solar Physics and Space Weather. They are typically used to study
and monitor the solar activity by using high temporal cadence observations at
different wavelength. The TSST (Tor vergata Synoptic Solar Telescope) is a new
synoptic telescope composed of two spectral channels: an H$\alpha$ (656.3 nm)
telescope and a Magneto Optical Filter (MOF)-based telescope in the Potassium
(KI D1) absorption spectral line at 769.9 nm. H$\alpha$ observations are
fundamental for the identification of flaring regions. The MOF-based telescope
will produce line of sight magnetograms and dopplergrams of the solar
photosphere, which are respectively used to study the magnetic field's geometry
in active regions and dynamics of the solar atmosphere. In this work, we
present an overview on the TSST and the optical design and characteristics of
the MOF-based telescope, whose optical scheme is a double-Keplerian 80mm
refractor with an aberration-free imaging lens.
