William Optics Telescopes & Accessories
William Optics makes quality refractor telescopes and equipment for all skill levels. Learn more about William Optics, or read our William Optics Telescopes Buying Guide.
- William Optics 2" to 1.25" RotoLock Eyepiece Adapter - Red # F-ROTO-A2-125RDIIOur Price: $53.00In StockFree US Shipping
- William Optics 1.25" 45-deg Erecting Prism Diagonal # D-EP125Our Price: $92.00In StockFree US Shipping
- William Optics 2" 99% Dielectric Dura Bright Carbon Fiber Mirror Diagonal for SCTsOur Price: $172.00In StockFree US Shipping
- William Optics 1.25" 99% Dielectric Dura Bright Carbon Fiber Star Mirror DiagonalOur Price: $110.00In StockFree US Shipping
- William Optics Camera Angle Adjuster / Rotator with M63 Threads # M-CAA63Our Price: $109.00In StockFree US Shipping
- William Optics SCT Thread Adapter for 2" Diagonal - GoldOur Price: $43.00In StockFree US Shipping
- William Optics Vixen Style Dovetail Mounting Base / Shoe for Finders # BAFM-ST001Our Price: $22.00In StockFree US Shipping Over $25
- DiscontinuedWilliam Optics RedCat 51 II 51mm f/4.9 Petzval Apo Refractor Telescope - RedOur Price: $865.00Out of StockFree Contiguous US Shipping
- William Optics All New Long Version Vixen-Style Dovetail Plate - 290mm (11.4") Length # M-PV...Our Price: $91.00In StockFree US Shipping
- William Optics Dual-Sided Vixen/Arca Swiss 110mm (4.3") Dovetail Plate - Red # M-PRC110RDOur Price: $36.00Out of StockFree US Shipping
- William Optics Swan Dovetail Plate for Losmandy Style Saddle: 400mm (15.7") Length - Red # M...Our Price: $116.00In StockFree US Shipping
- William Optics Mounting Rings (Set of 2) - 90mm (3.54")Our Price: $148.00In StockFree US Shipping
- William Optics Dual-Sided Vixen/Arca Swiss 245mm (9.6") Dovetail Plate - Red # M-PRC245RDOur Price: $49.00In StockFree US Shipping
- William Optics RedCat / SpaceCat Single Mounting Ring - Black # M-MR50RC-BLOur Price: $43.00In StockFree US Shipping
- William Optics Black Mounting Ring with Space Gray Handle/Saddle Bar for SpaceCatOur Price: $87.00Out of StockFree US Shipping
- William Optics 48mm Wide T-Ring for Sony E-Mount Cameras - Black # TM-SN-E-M48Our Price: $45.00In StockFree US Shipping
- William Optics 48mm Wide T-Ring for Canon EOS-R Mirrorless Cameras # TM-CN-EOSR-M48Our Price: $56.00In StockFree US Shipping
- William Optics All New 50mm UniGuide Scope with Slide-base - Gold # M-G50PB-WGOur Price: $171.00In StockFree US Shipping
- William Optics 2" Push-In Nosepiece for William Optics DiagonalsOur Price: $33.00Out of StockFree US Shipping
- William Optics Diffraction Spikes Bahtinov Focusing Mask - For Telescope Tube/Dewshield Diam...Our Price: $56.00In StockFree US Shipping
- William Optics 243mm Saddle Handle Bar - Black # M-HC243BLOur Price: $90.00In StockFree US Shipping
- William Optics 243mm Saddle Handle Bar with 50mm Clamping Guiding Rings # M-HC243BL-GR50IISLOur Price: $141.00Out of StockFree US Shipping
About William Optics Telescopes & Accessories
William Optics is a Taiwanese telescope and accessories company founded in 1996 by amateur astronomer William Yang. His goal was simple: to create affordable, top quality refractor telescopes for everyone.
William has absolutely accomplished his goal, and now has a number of very popular refractor telescope lines. These include entry-level refractors like the Zenithstar series all the way up to top-of-the-line Fluorostar series. Some of William Optics’ most well-known telescopes include:
- William Optics RedCat 51
- William Optics RedCat 71
- William Optics Zenithstar 61
- William Optics Zenithstar 73
- William Optics GT81
- plus many more
The telescopes William and his team produce are especially popular for widefield and deep sky astrophotography. Many of these refractors are made with high quality components, glass, and optical performance.
The company also makes a wide variety of accessories for both visual astronomy and astrophotography, including eyepieces, diagonals, t-rings, field flatteners, reducer/flatteners, focusers, rotators, Bahtinov masks, and more. It’s truly hard to go wrong with a telescope or accessory made by William Optics.
The company is sometimes mistakenly called misnomers such as Williams Optics and William Optic, but their true name is William Optics.