William Optics, a Chinese manufacturer of small telescopes and accessories, was founded by William Yang. The WO products are very high quality, in general, while priced in the ballpark of what is reasonable for amateurs. Their scopes, such as the Megrez 90 that I owned, are excellent in fit and finish, while perhaps not being top in optical quality - but still represent a very good performance-to-cost ratio. WO also makes several sets of eyepieces, including their SWAN (super wide angle) series, and their SPL (super planetary) series.

I used the SPL 3mm eyepiece with the Megrez, but decided to sell it (along with most of the other EPs) to fund my astro-imaging equipment.