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The Epsilon series of astrographs are specifically designed for exceptional astrophotography. Takahashi's proprietary optical design features a hyperbolic, concave primary mirror with a 2 element ED corrector lens to eliminate spherical aberration and coma. Epsilon series telescopes also feature an offset secondary for improved illumination. Compared to the conventional Schmidt camera design, the chromatic aberration is reduced by half, even out to large viewing angles.