SOFT( So–––lar F––lare T––elescope So_larF_lareT_elescope ) installed at BOAO(Bohyunsan Optical Astronomy Observatory) is purposed for observing solar active regions using four refractors on single mount with a 400"×300" 400"×300" field of view: Two refractors with a diameter of 15cm(f15) are observe the white light and Hα Hα , and the other two refractors with a diameter of 20cm(f8) are observe the magnetic field distribution and Doppler shifts at the solar chromosphere. Three Lyot filters, one of the most important observational instruments, are installed on the optical rails for VMG, LMG, and Hα Hα that possible to very narrow pass band observation under high precision stability of temperature. From the combination of KD*P and quarter wave plate in the Lyot filter possible observe the magnetic fields strength and doppler shifts by using the characteristics of polarization components. In this paper, we introduce the basic characteristics, optical system, and monitor system of the SOFT.

• 박영득(천문대 보현산천문대) | Park Young-Deuk (Bohyunsan Optical Astronomy Observatory, Korea Astronomy Observatory)
• 문용재(천문대 보현산천문대) | Moon Yong-Jae (Bohyunsan Optical Astronomy Observatory, Korea Astronomy Observatory)
• 장비호(천문대 보현산천문대) | Jang Be-Ho (Bohyunsan Optical Astronomy Observatory, Korea Astronomy Observatory)
• 심경진(천문대 응용천문연구부) | Sim Kyung-Jin (Division of Applied Astronomy, Korea Astronomy Observatory)