TOA Series

The TOA series is a member Takahashi's line of triplet refractors. The TOA design, three lens elements are used, with the front and rear constructed from ED glass. The resulting system achieves a high level of apochromatic performance for both visual observation
and imaging.

Takahashi engineers have undertaken a complete redesign of the triplet system, completely eliminating spherical aberration while minimizing axial chromatic aberration in the visible light spectrum. In typical apochromatic designs, the elimination of chromatic aberration is usually at the expense of increasing spherical aberration at various wavelengths. However, with the TOA series, the focal shift across the entire visible spectrum from 436 nm up to 656 nm is less than +0.01 mm This is less than 1/188 the aberration of a typical apochromatic design