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  • William Optics 2
    William Optics William Optics 2" Dura Bright Dielectric Mirror Diagonal with Thermometer - D-DIG2D-C-DB
    $139.00
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  • William Optics 40 mm Super Wide Angle Eyepiece - 2
    William Optics William Optics 40 mm Super Wide Angle 2" Eyepiece - E-SWA40
    $118.00
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  • William Optics Soft Carry Case with No Foam for GTF81 and GT81 Refractors
    William Optics William Optics Soft Carry Case for GTF81 and GT81 - No Foam - BG1-P002
    $58.00
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  • William Optics 1.25
    William Optics William Optics 1.25" Dielectric Diagonal W/ Carbon Fiber Plates - D-125D-C-DB
    $89.00
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  • William Optics Binoviewer Package with Eyepieces & Barlow
    William Optics William Optics Binoviewer W/Eyepieces & Barlow Nosepiece - E-BINO-P
    $268.00
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  • William Optics Long Vixen
    William Optics William Optics Long Vixen Style Dovetail Plate - M-PV-L
    $68.00
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  • William Optics Soft Carry Case for 71 mm Telescopes - No Foam
    William Optics William Optics Soft Carry Case for Z71 - No Foam - BG1-P004
    $59.00
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  • William Optics 9 mm SWAN 1.25
    William Optics William Optics 9 mm Super Wide Angle 1.25" Eyepiece - E-SWA09
    $79.00
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  • William Optics 7 mm UWAN Eyepiece - 1.25
    William Optics William Optics 7 mm Ultra Wide Angle 1.25" Eyepiece - E-UWA07
    $198.00
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  • William Optics 45º Erect Prism - 1.25
    William Optics William Optics 1.25" 45° Erect Prism - D-EP125
    $80.00
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  • William Optics 20 mm SWAN Eyepiece - 1.25
    William Optics William Optics 20 mm Super Wide Angle 1.25" Eyepiece - E-SWA20
    $79.00
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  • William Optics Soft Carry Case for FLT98, FLT110, GT102, & GTF102 - No Foam
    William Optics William Optics Soft Carry Case for FLT98, FLT110, GT102, GTF102 - No Foam - BG1-P001
    $168.00
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  • William Optics 2x Barlow Nosepiece for Binoviewers - 1.25
    William Optics William Optics 1.25" 2x Barlow Nosepiece for Binoviewers - E-BINO-B2
    $38.00
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  • William Optics 12.5 mm Super Planetary Long Relief Eyepiece
    William Optics William Optics 12.5 mm Super Planetary Long Eye Relief Eyepiece - E-SPL125
    $108.00
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  • William Optics 25 mm SWAN 2
    William Optics William Optics 25 mm Super Wide Angle 2" Eyepiece - E-SWA25
    $118.00
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  • William Optics 33 mm Super Wide Angle 2
    William Optics William Optics 33 mm Super Wide Angle 2" Eyepiece - E-SWA33
    $118.00
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  • William Optics 50 mm Finderscope with 90º Erecting Prism - White
    William Optics William Optics 50 mm Finder - White W/90° Erecting Prism - M-F50
    $145.00
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  • William Optics 90 mm Mounting Rings
    William Optics William Optics 90 mm Mounting Rings - M-M80R-B
    $128.00
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  • William Optics 2.25
    William Optics William Optics Extender for FLT 110 & 132 Telescopes - P-EXFLT
    $58.00
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  • William Optics Single Piece 2
    William Optics William Optics One Piece 2" Canon EOS Photo Adapter - P-PA-C
    $68.00
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  • William Optics SLT-1100 FLT Adapter
    William Optics William Optics STL CCD Camera Adapter - P-STL
    $112.00
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  • William Optics Canon EOS 42 mm T-Ring
    William Optics William Optics M42 Canon T-Ring - YE-TR-CE
    $10.00
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  • William Optics 2
    William Optics William Optics 2" Durabright RotoLock Diagonal - D-DIG2D-ROTO-A2
    $198.00
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  • William Optics 2
    William Optics William Optics 1.25" to 2" RotoLock Adapter - F-ROTO-A2-125
    $45.00
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  • William Optics RotoLock Eyepiece Adapter & Visual Back for 2 WO Diagonals
    William Optics William Optics RotoLock Upgrade for WO 2" Diagonals - D-ROTO-A2
    $89.00
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  • William Optics 2
    William Optics William Optics 2" RotoLock Eyepiece Adapter / Visual Back with 42mm Female Threads - D-ROTO-A2-M42F
    $99.00
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  • William Optics 2
    William Optics William Optics 2" RotoLock Eyepiece Adapter / Visual Back with 48mm Male Threads - D-ROTO-A2-M48M
    $99.00
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  • William Optics 2
    William Optics William Optics RotoLock Eyepiece Adapter / Visual Back with SCT 3.28" Threads - D-ROTO-A2-SCT328F
    $99.00
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  • William Optics 71 mm Four Element f/4.9 Refractor OTA
    William Optics William Optics Star71 Four Element f/4.9 Imaging Refractor w/2.5" Focuser - A-WO71-II
    $1,148.00
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  • William Optics 90º Erect Prism Diagonal - 1.25
    William Optics William Optics 90º 1.25" Erect Prism DIagonal - D-EP90-125
    $69.00
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  • William Optics Canon EOS T-Mount for Star 71 Refractors
    William Optics William Optics Canon T-Mount for Star 71 Refractors - YE-TR-WO71
    $20.00
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  • William Optics Caon EOS Camera Adapter
    William Optics William Optics Canon EOS Camera Adapter - AD4-A009-L00BL03
    $58.00
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  • William Optics Flat4 Draw Tube Adapter for FLT Telescopes
    William Optics William Optics Flat4 Draw Tube Adapter for FLT Telescopes - AD4-A006-L00GD03
    $58.00
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  • William Optics 102 mm Golden Gran Turismo f/6.9 Triplet APO Refractor - 20th Anniversary Edition
    William Optics William Optics GT102 Golden f/6.9 Triplet Refractor - 20th Anniversary Edition - A-F102GTSG-VP20A
    $2,398.00
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  • William Optics GT71 Gold Trim Triplet APO Refractor Telescope
    William Optics William Optics GT71 f/5.9 Gold Triplet APO Refractor - A-F71GT
    $828.00
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  • William Optics GT71 Triplet APO Refractor with Flattener
    William Optics William Optics GT71 f/5.9 Gold Triplet APO Refractor w/Flattener - A-F71GT-AP
    $928.00
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  • William Optics GT71 f/5.9 20th Anniversary Gold Triplet Refractor
    William Optics William Optics GT71 f/5.9 Gold Triplet APO Refractor - 20th Anniversary Edition - A-F71GT-VP20A
    $958.00
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  • William Optics 71 mm f/4.9 Star Imaging Refractor - Blue Edition with Soft Case
    William Optics William Optics Star71 Four Element f/4.9 Imaging Refractor w/2.5" Focuser - Limited Blue Edition - A-WO71-IIBU
    $1,148.00
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  • William Optics Blue ZenithStar 61 f/5.9 APO Doublet Refractor OTA
    William Optics William Optics ZenithStar 61 mm f/5.9 APO Doublet Refractor Telescope - Blue Edition - A-Z61BU
    $478.00
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  • William Optics Field Flattener for ZenithStar 61 APO
    William Optics William Optics Flattener 61 for ZenithStar 61 APO - P-FLAT61
    $168.00
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William Optics provides quality refractors, mounts, and accessories such as eyepieces, diagonals, and mounting hardware for amateur astronomers around the world. The CEO of the company is David Yang, an avid amateur astronomer and bird-watcher who feels strongly about offering premium optics to everyone with an interest in astronomy or nature, and not just to those with plenty of cash to spare.

When William Yang was a child, he thumbed through the pages of Sky & Telescope magazine and gazed at the beautiful images of our universe laid before him. His family could not afford to buy him a telescope, but he could dream of a day when he would be able to photograph galaxies and nebulae like the astrophotographers he admired so much. In 1986, David saved up all summer to buy a telescope to watch Halley's Comet, but before that he tried his hand at building his own telescopes with whatever supplies he could find; he even "borrowed" his grandmother's eyeglasses to use as the lenses for his first refractor!

In 1996, David opened William Optics in Taiwan. Four years later, in 2000, William Optics USA began by offering their break-out 80mm Megrez refractor to consumers in the United States. The quality, as well as the price, was amazing, and before long, William Optics had positioned themselves as one of the world leaders in fast, highly portable quality refractors.

William Optics also makes some great telescope accessories. Their WO Diagonals are celebrated the world over for their machining and optical quality, and their Ultra Wide Angle (UWA) and Super Wide Angle (SWA) eyepieces, with their unusual jet-black insertion barrels, have come to be known for their quality, but at an affordable price. We think William Yang has achieved what he set out to do; providing "More Quality for Less Money"; and we look forward to what he plans to do next!

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