In order to perform precise and high time cadence magnetic field measurement across the solar surface, the Tandem
Fabry-Perot filter imaging spectro-polarimeter for the Solar Magnetic Activity Research Telescope (SMART) is revised.
By using the CCD with moderate frame rate of 30fps, full Stokes vectors on the field-of-view 320"x240" can be obtained
at 4 wavelengths around FeI6302 line within about 15s. The optical performance of the Tandem Fabry-Perof filters is
investigated by using the spectrograph at the Domeless Solar Telescope at Hida Observatory. The test results show the
full-width-half-maximum (FWHM) of the tandem filters is about 0.017nm over the 60mm clear aperture is achieved. The
system is developed to start the regular observations from 2010.