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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

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$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 ...

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$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

Reduces focal length by a factor of 0.8x Designed for the William Optics Zenithstar 73 telescope Provides edge-to-edge flat field for full-frame s...

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$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

Patented Bahtinov mask integrated into a dust cover Precision-cut pattern for accurate focusing Designed for William Optics GT71, Z73, and Star71I...

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$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...

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$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...

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$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

Patented Bahtinov Mask and Dust Cover Combination Designed Exclusively for the William Optics ZenithStar 61 Durable Metal Construction Signature W...

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$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

Includes two 20mm 66° wide-angle eyepieces High-quality BaK4 prisms with full multi-coatings Large 20mm clear prism aperture prevents vignetting I...

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$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

Length: 250 mm Width: 50 mm Dual Dovetail: Manfrotto & Arca-Swiss Compatible Weight: 0.32 kg / 0.71 lbs Ideal for Balancing Long Lenses & ...

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$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

Adds 360° of smooth camera rotation Designed for William Optics 2.5" focusers Secure M63 male and female threads Maintains optical alignment durin...

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$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 ...

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$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

Designed specifically for the William Optics FLT132 refractor Ensures a precise, secure fit for the optical tube Soft-sided construction for light...

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$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

91mm Aperture, 448mm Focal Length (f/4.9) 5-Element Advanced Petzval Optical Design 55mm Corrected Image Circle WIFD Rack & Pinion Internal Fo...

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$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

50mm Inner Diameter Solid Aluminum Construction Anodized Blue Finish 1/4"-20 Threaded Mounting Holes Weight: 4.9 oz (140 g) Description FAQ Spe...

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$50.00 - $50.00
$50.00
$50.00 - $50.00
$50.00
$60.00 - $60.00
$60.00
$60.00 - $60.00
$60.00

William Optics Cat Series Saddle Handle Bar

Options available
3 variants in stock

Length: 107 mm Integrated Mini-Vixen Style Saddle Weight: 0.12 kg / 0.26 lbs Designed for William Optics Cat Series Telescopes Adds a carrying han...

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$60.00 - $60.00
$60.00
$60.00 - $60.00
$60.00
$36.00 - $38.00
$36.00 - $38.00
$36.00 - $38.00
$36.00

William Optics DSD 110 Plate

Options available
5 variants in stock

Dual Saddle Plate Design Accepts Vixen-Style Dovetails Accepts Losmandy D-Style Dovetails Precision CNC-Machined Construction Durable Anodized Fin...

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$36.00 - $38.00
$36.00 - $38.00
$36.00 - $38.00
$36.00
$45.00 - $48.00
$45.00 - $48.00
$45.00 - $48.00
$45.00

William Optics DSD 210 Plate

Options available
3 variants in stock

210 mm total length for balancing flexibility Dual-profile fits both Vixen-style and Arca-Swiss clamps 41.5 mm width provides a stable mounting su...

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$45.00 - $48.00
$45.00 - $48.00
$45.00 - $48.00
$45.00
$51.76 - $58.00
$51.76 - $58.00
$51.76 - $58.00
$51.76

William Optics DSD 245 Plate

Options available
2 variants in stock

Length: 245 mm Weight: 0.33 kg / 0.72 lbs Dovetail Compatibility: Vixen & Arca-Swiss CNC-machined construction Description FAQ Specificatio...

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$51.76 - $58.00
$51.76 - $58.00
$51.76 - $58.00
$51.76
$388.00 - $388.00
$388.00
$388.00 - $388.00
$388.00

William Optics Elite Drawer OAG Kit

WO-M-OAG-ED
4 in stock

Integrates Off-Axis Guider and Filter Drawer 37.5 mm Optical Length Supports M48, M54, and M68 Connections Magnetic M48 Filter Holder 336 g (11.85...

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$388.00 - $388.00
$388.00
$388.00 - $388.00
$388.00
$34.00 - $34.00
$34.00
$34.00 - $34.00
$34.00

William Optics Extension Bar for iOptron Skyguider Pro

WO-M-IO-EB20RD
2 in stock

Adds a declination axis to the iOptron SkyGuider Pro Specifically designed to fit the iOptron SkyGuider Pro Description The Wi...

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$34.00 - $34.00
$34.00
$34.00 - $34.00
$34.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Flat4 Draw Tube Adapter for FLT (Gold) for 2007-2016 Models

WO-AD4-A006-L00GD03

Securely connects the Flat4 Field Flattener to the draw tube Designed for William Optics FLT 98, 110, 132, and 152 models Compatible with telescop...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Flat4 Draw Tube Adapter for GT102, FLT 132 - Black for 3" V-Power Focuser

WO-AD4-A006-L00BL03

Connects William Optics Flat4 Flattener to Draw Tube Designed for the 3" V-Power Focuser Compatible with GT102 & FLT 132 (2017 Models) Ensures...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Flat4 Draw Tube Adapter for GT102, FLT 132 - Blue for 3" V-power Focuser

WO-AD4-A006-L00BU03

Connects Flat4 Flattener to 3" V-Power Focuser Compatible with William Optics GT102 & FLT 132 Engineered for 2017 Telescope Models Secure Thre...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00

William Optics Flattener 68III

WO-P-FLAT68III

1.0x Flattener Power preserves native focal length Corrects field curvature for Full Frame sensors Designed for William Optics FLT132, GT102, and ...

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$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00
$3,598.00 - $3,598.00
$3,598.00
$3,598.00 - $3,598.00
$3,598.00

William Optics Fluorostar 120

Options available

120mm Aperture FPL-53 Triplet Apochromatic Optics 3.3" Rack & Pinion Focuser Built-in Camera Angle Rotator Integrated Bahtinov Mask Descrip...

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$3,598.00 - $3,598.00
$3,598.00
$3,598.00 - $3,598.00
$3,598.00