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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 Red Dot Finder & Quick Release Bracket
    William Optics William Optics Red Dot Finder with Quick Release Bracket - M-RDF-P
    $77.00
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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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  • WYO-Red Dot Finder
    William Optics William Optics Red Dot Finder - M-RDF
    $57.00
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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 8x42 Semi APO Binoculars
    William Optics William Optics 8 X 42 Semi APO Binoculars - H-B8X42ED
    $188.00
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  • William Optics 2
    William Optics William Optics 2" Dura Bright Dielectric SCT Diagonal - D-DIG2D-C-DB-SCT
    $158.00
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  • William Optics William Optics Nosepiece for 2" Diagonal - WD-DIG2A
    $30.00
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  • William Optics 10x42 Semi APO Binoculars
    William Optics William Optics 10 X 42 Semi APO Binoculars - H-B10X42ED
    $188.00
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  • William Optics 10x50 ED Astro Binoculars
    William Optics William Optics 10 X 50 ED Astro Binoculars - H-B10x50ED
    $298.00
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  • William Optics SCT to Flattener 6 Adapter
    William Optics William Optics SCT to Flattener 6 Adapter - AD4-A015
    $28.00
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  • William Optics 2
    William Optics William Optics One Piece 2" Canon EOS Photo Adapter - Extra Long - P-PACL
    $68.00
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  • William Optics GT102 APO Flattener
    William Optics William Optics APO Flattener for GT102 - P-F6A-GT102
    $178.00 $169.95
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  • William Optics Red Double Decker Saddle Plate for Losmandy and Vixen Dovetails
    William Optics William Optics Double Decker (Losmandy & Vixen) Saddle Plate - Red - M-DDS
    $159.00
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  • William Optics Black Vixen Style Dovetail Plate - 7.9
    William Optics William Optics Vixen-Style 7.9" Dovetail Plate - Black - M-PVB
    $39.00
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  • William Optics 3.5
    William Optics William Optics 3.5" to 2" RotoLock Visual Back - F-ROTO-A3.5-2
    $168.00
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  • William Optics 1.25
    William Optics William Optics 1.25" Dura-Bright Diagonal for Star71 Telescope - D-125D-WO71
    $135.00
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  • William Optics Soft Carry Case for FLT132 - No Foam
    William Optics William Optics FLT132 Soft Carry Case - No Foam - BG1-P005
    $189.00
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  • William Optics Padded Soft Carry Case for FLT132 - Foam Not Included
    William Optics William Optics FLT132 Soft Carry Case with Pre-Cut Foam - BG1-P005-A01BL01
    $298.00
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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 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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