William Optics Corp. was founded in 1996 as "Optical technology Limited" by brothers William and David Yang for the purpose of making astronomical telescopes for use by the more demanding amateur astronomer and birder. The company is based in Tapei, Taiwan, with optical production of their telescopes in Taiwan. William Optics has established offices and distributors overseas including in the USA. Unlike many other companies based in China or Taiwan at the time the Yangs set out to develop telescopes that are more refined in terms of performance and durable, with features that appeal to the more demanding amateur. The William Optics company subcontracts their designs for production by other companies, and also resells products that are sometimes marketed by other companies too. They have introduced a number of highly perfected specialized products that is making them more and more appreciated by the most demanding amateur astronomer and birder.
In a relatively short time, William Optics has established itself and its products as one of the world leaders in short-tube, highly-portable refractors, and has achieved quality recognition for many accessories such as the well celebrated WO Diagonals.