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 243mm Saddle Handle Bar with 50mm Six-Point Guiding Rings # M-HC243BL-GR50SLOur Price: $149.00In StockFree US Shipping
- William Optics Adjustable Field Flattener 73A for Z73 Telescope # P-FLAT73AOur Price: $229.00In StockFree US Shipping
- William Optics Diffraction Spikes Bahtinov Focusing Mask - For Telescope Tube/Dewshield Diam...Our Price: $49.00In StockFree US Shipping
- William Optics 50mm f/4 Guide Scope with 1.25" RotoLock III - Available in 4 ColorsFrom Our Price: $148.00Free US Shipping
- William Optics 2" to 1.25" RotoLock Eyepiece Adapter - Gold # F-ROTO-A2-125GDIIOur Price: $53.00In StockFree US Shipping
- William Optics SCT Dust Plug with Center Pull Tab: OD = 2" (50.8mm), Plastic, WhiteOur Price: $3.50In StockFree US Shipping Over $25
- William Optics 1.25" 90-deg Erecting Prism Diagonal with Helical Focusing # D-EP90-125IIOur Price: $96.00In StockFree US Shipping
- DiscontinuedWilliam Optics RedCat 71 f/4.9 Petzval Apo Refractor Telescope (do not delete)Our Price: $1,698.00Out of StockFree Contiguous US Shipping
- DiscontinuedWilliam Optics RedCat 71 f/4.9 Petzval Apo Refractor Telescope (Discontinued)Our Price: $1,698.00Out of StockFree Contiguous US Shipping
- SpecialWilliam Optics ZenithStar Z61II 61mm f/5.9 Doublet Apo Refractor with Soft Case # A-Z61II (A...From Our Price: $599.00Free US Shipping
- William Optics All New 50mm UniGuide Scope with Slide-base - Space Gray # M-G50PB-TGOur Price: $171.00In StockFree US Shipping
- William Optics Vixen Style Mount for iOptron SkyGuider Pro & Sky-Watcher Star Adventurer - L...Our Price: $229.00Out of StockFree US Shipping
- William Optics 48mm Wide T-Ring for Nikon Z-Mount Mirrorless Cameras # TM-NK-Z-M48Our Price: $56.00Out of StockFree US Shipping
- William Optics Swan Dovetail Plate for Losmandy Style Saddles: 400mm (15.7") Length - Gold #...Our Price: $116.00In StockFree US Shipping
- William Optics 50mm Slide-Base Six-Point Guiding Rings # GR50SLOur Price: $64.00In StockFree US Shipping
- William Optics Zenithstar 73mm f/5.9 Full Frame Imaging Apo Refractor with Soft Case - Red #...Our Price: $730.00Out of StockFree US Shipping
- William Optics Dual-Sided Vixen/Arca Swiss 210mm (8.3") Dovetail Plate - Gold # M-PRC210GDOur Price: $45.00Out of StockFree US Shipping
- William Optics Finder Bracket for 50mm Finders with Vixen/Synta-Style Base - Black # M-FB50-BOur Price: $64.00In StockFree US Shipping
- William Optics Adjustable Field Flattener 68III # P-FLAT68IIIOur Price: $656.00In StockFree US Shipping
- William Optics 1.25" RotoLock SCT Visual Back # F-ROTO-A2-125-SCT-TAOur Price: $87.00In StockFree US Shipping
- William Optics Cat Saddle Handle Bar for Redcat / Spacecat 51 Telescope - Black # M-HCRC-BLOur Price: $53.00In StockFree US Shipping
- William Optics Zenithstar 73mm f/5.9 Full Frame Imaging Apo Refractor with Soft Case - Gold ...Our Price: $730.00In StockFree US Shipping
- William Optics 1.25" 90-deg Erecting Prism Diagonal for RedCat/WhiteCat 51 only (Silver) # D...Our Price: $137.00In StockFree US Shipping
- William Optics 0.8x Reducer / Adjustable Field Flattener 6AIII for FLT91 Telescope # P-FLAT6...Our Price: $293.00In 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.