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High precision astrometry aims at source position determination to a verysmall fraction of the diffraction image size, in high SNR regime. One of thekey limitations to such goal is the optical response variation of the telescopeover a sizeable FOV, required to ensure bright reference objects to anyselected target. The issue translates into severe calibration constraints,and/or the need for complex telescope and focal plane metrology. We propose aninnovative system approach derived from the established TMA telescope concept,extended to achieve high filling factor of an annular field of view around theoptical axis of the telescope. The proposed design is a very compact, 1 m classtelescope compatible with modern CCD and CMOS detectors (EFL = 15 m). Wedescribe the concept implementation guidelines and the optical performance ofthe current optical design. The diffraction limited FOV exceeds 1.25 squaredegrees, and the detector occupies the best 0.25 square degree with 66 devices.

RAFTER: Ring Astrometric Field Telescope for Exo-planets and Relativity