Takahashi
Takahashi's manufacture of refractors, Newtonian reflectors, Cassegrain/Newtonians, classical Cassegrains, hyperbolic astrographs, corrected Baker RC astrographs, mounts and oculars makes it one of the most versatile companies of its type in the world.
The current line of Ortho Apochromatic refractors use a design that is absolutely color free, will include a 110mm, 130mm [currently produced], 150mm [introduced 06/05] and a 180mm. Coming also is a line of Ortho Astrographs.
Takahashi's staff includes: optical, design and mechanical engineers many of whom are amateur astronomers, who have discovered new asteroids one of which was named Urii in honor of the city where the Takahashi manufacturing facilities are located.