Over the past few years, however, they have introduced the innovative T-2 system of diagonals and accessories along with a half-dozen otherdiagonals to the product mix. William Optics refractors feature metal tubes and trim, ED (extra-low dispersion) glass in the objectives, and premium focusers for holding cameras and astrophotography accessories. Overview For many years, Baader Planetarium offered just a small handful of premium quality star diagonals. Founded by William Yang in 1996, the company concentrates on making high-quality and affordable refracting telescopes with a distinctive design and a robust build. Diagonals use either a mirror or a prism to bend light at a 90-degree angle. William Optics is a Taiwan-based manufacturer of telescopes and astronomical accessories.
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