Skip to content
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

Products

Filters

$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

William Optics 48mm T-Mount for Pentax K - Black

WO-TM-PT-K-M48
1 in stock

High-precision M48 T-Mount Adapter For Pentax K series cameras Description The William Optics 48mm T-Mount for Pentax K is a high...

View full details
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00

William Optics 48mm T-Mount for Sony E - Black

WO-TM-SN-E-M48
3 in stock

48mm T-Mount designed specifically for Sony E-mount cameras Allows seamless connection between your Sony E-mount ca...

View full details
$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00
$148.00 - $178.00
$148.00 - $178.00
$148.00 - $178.00
$148.00

William Optics 50mm Guiding Scope

Options available
1 variants in stock

Make it easier to find and track guide stars User-friendly and can be set up quickly Description The William Optics 50mm Guiding ...

View full details
$148.00 - $178.00
$148.00 - $178.00
$148.00 - $178.00
$148.00
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

William Optics 75mm -110mm Bahtinov Focusing Mask

WO-BM-DS-GR45

Precise focusing aid for telescopes with apertures between 75mm and 110mm Adjustable design to fit various telescope sizes within the specif...

View full details
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
$116.00 - $116.00
$116.00
$116.00 - $116.00
$116.00

William Optics 90° Erect Prism - 1.25"

WO-D-EP90-125II
6 in stock

90-degree erecting prism for 1.25" telescope eyepieces Provides correct image orientation for terrestrial and astronomical viewing Des...

View full details
$116.00 - $116.00
$116.00
$116.00 - $116.00
$116.00
$138.00 - $138.00
$138.00
$138.00 - $138.00
$138.00

William Optics 99% Dielectric Dura Bright Diagonal - 1.25"

WO-D-125D-C-DB
1 in stock

High-quality 1.25" diagonal for refractor and catadioptric telescopes 99% reflectivity dielectric coating for maximum light transmission ...

View full details
$138.00 - $138.00
$138.00
$138.00 - $138.00
$138.00
$158.00 - $158.00
$158.00
$158.00 - $158.00
$158.00

William Optics 99% Dielectric Dura Bright Diagonal - 2"

WO-D-DIG2D-C-DB-T
4 in stock

High-quality 2" diagonal for refractor and catadioptric telescopes 99% reflectivity dielectric coating for maximum light transmission ...

View full details
$158.00 - $158.00
$158.00
$158.00 - $158.00
$158.00
$278.00 - $278.00
$278.00
$278.00 - $278.00
$278.00

William Optics Adjustable Flat61 for Z61

WO-P-FLAT61A
1 in stock

Adjustable field flattener specifically designed for the William Optics Z61 telescope Improves edge-to-edge sharpness for astrophotography w...

View full details
$278.00 - $278.00
$278.00
$278.00 - $278.00
$278.00
$269.00 - $269.00
$269.00
$269.00 - $269.00
$269.00

William Optics Adjustable Flat6AIII

WO-P-FLAT6AIII
2 in stock

Versatile field flattener for William Optics refractor telescopes Adjustable design for optimal performance with various camera setups ...

View full details
$269.00 - $269.00
$269.00
$269.00 - $269.00
$269.00
$348.00 - $348.00
$348.00
$348.00 - $348.00
$348.00

William Optics Adjustable Flat6AIII for FLT91

WO-P-FLAT6AIII-M92

0.8x reducer For William Optics FLT91 refractor Description The William Optics Adjustable Flat6AIII for FLT91 is a special editio...

View full details
$348.00 - $348.00
$348.00
$348.00 - $348.00
$348.00
$278.00 - $278.00
$278.00
$278.00 - $278.00
$278.00

William Optics Adjustable Flat73A for Z73

WO-P-FLAT73A
1 in stock

Improves edge-to-edge sharpness for astrophotography 43mm image circle Adjustable design 66.2mm back focus Description Specifications In the Bo...

View full details
$278.00 - $278.00
$278.00
$278.00 - $278.00
$278.00
$284.00 - $284.00
$284.00
$284.00 - $284.00
$284.00

William Optics Adjustable Reducer Flattener Flat61R for Z61

WO-P-FLAT61R

Adjustable reducer and field flattener for William Optics Z61 telescope Improves image sharpness and reduces distortion Description ...

View full details
$284.00 - $284.00
$284.00
$284.00 - $284.00
$284.00
$284.00 - $284.00
$284.00
$284.00 - $284.00
$284.00

William Optics Adjustable Reducer Flattener Flat73R for Z73

WO-P-FLAT73R

Adjustable reducer and field flattener for William Optics Z73 telescope Improves image sharpness and reduces distortion Description ...

View full details
$284.00 - $284.00
$284.00
$284.00 - $284.00
$284.00
$102.00 - $118.00
$102.00 - $118.00
$102.00 - $118.00
$102.00

William Optics Bahtinov Mask Cover for GT71 / Z73 / Star71II

Options available

Bahtinov mask cover for William Optics GT71, Z73, and Star71II telescopes Enhances focusing accuracy for astrophotography Description ...

View full details
$102.00 - $118.00
$102.00 - $118.00
$102.00 - $118.00
$102.00
$113.00 - $113.00
$113.00
$113.00 - $113.00
$113.00

William Optics Bahtinov Mask Cover for GT81 / Z81

Options available

Bahtinov mask cover for William Optics GT81 and Z81 telescopes Enhances focusing accuracy for astrophotography Description The Willi...

View full details
$113.00 - $113.00
$113.00
$113.00 - $113.00
$113.00
$185.00 - $185.00
$185.00
$185.00 - $185.00
$185.00

William Optics Bahtinov Mask Cover for Takahashi FSQ106

Options available

Bahtinov mask cover for Takahashi FSQ106 telescope Enhances focusing accuracy for astrophotography Description The William Optics Ba...

View full details
$185.00 - $185.00
$185.00
$185.00 - $185.00
$185.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Bahtinov Mask Cover for WO Z61

WO-CPBM-61GD

Precision focusing aid for the William Optics Z61 telescope Custom-designed to fit the Z61 model perfectly Description The Wil...

View full details
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$369.00 - $369.00
$369.00
$369.00 - $369.00
$369.00

William Optics Binoviewer Complete Package

WO-E-BINO-P
7 in stock

Enhances visual astronomy with comfortable two-eye viewing Complete package includes binoviewer, eyepieces, and accessories Descriptio...

View full details
$369.00 - $369.00
$369.00
$369.00 - $369.00
$369.00
Sold out
$67.00 - $67.00
$67.00
$67.00 - $67.00
$67.00

William Optics Birding 250mm Duelside Plate (Manfrotto & Arca Swiss Type) - DISCONTINUED

WO-M-PMA250

Work with Vixen-style dovetail bars Made of durable materials Description The William Optics Birding 250mm Duelside Plate is an acces...

View full details
$67.00 - $67.00
$67.00
$67.00 - $67.00
$67.00
Sold out
$129.00 - $129.00
$129.00
$129.00 - $129.00
$129.00

William Optics Camera Angle Rotator for 2.5" M63 Focuser

WO-M-CAA63
1 in stock

Camera angle rotator designed for William Optics 2.5" M63 focuser Allows precise adjustment of the camera angle for...

View full details
$129.00 - $129.00
$129.00
$129.00 - $129.00
$129.00
Sold out
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Canon EOS Camera Adapter - Discontinued

WO-AD4-A009-L00BL03

Allows attachment of Canon EOS cameras to William Optics telescopes Ensures a secure and stable connection for astrophotography Description ...

View full details
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
Sold out
$249.00 - $249.00
$249.00
$249.00 - $249.00
$249.00

William Optics Carry Soft Case for FLT132

WO-BG1-P005

Soft carry case designed specifically for the William Optics FLT132 telescope Offers protection and convenience for...

View full details
$249.00 - $249.00
$249.00
$249.00 - $249.00
$249.00
$2,598.00 - $2,998.00
$2,598.00 - $2,998.00
$2,598.00 - $2,998.00
$2,598.00

William Optics Cat 91 WIFD

Options available
1 variants in stock

Petzval Design, No Backfocus Hassles Full-Frame & Medium-Format Ready, No Extra Flattener Needed Fast f/4.9 Focal Ratio Seamle...

View full details
$2,598.00 - $2,998.00
$2,598.00 - $2,998.00
$2,598.00 - $2,998.00
$2,598.00
$50.00 - $50.00
$50.00
$50.00 - $50.00
$50.00

William Optics Cat Mounting Ring

WO-M-MR50RC-BL

Seamlessly integrate with your existing astrophotography gear. Ensures stable attachment of your telescope to your mount. Description In th...

View full details
$50.00 - $50.00
$50.00
$50.00 - $50.00
$50.00