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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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$141.00 - $141.00
$141.00
$141.00 - $141.00
$141.00

William Optics 243mm Saddle Handle Bar with 50mm Guiding Rings

WO-M-HC243BL-GR50IISL

Compatible with William Optics' slide-base guide rings Can be used to make William Optics telescopes portable Description The Wil...

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$141.00 - $141.00
$141.00
$141.00 - $141.00
$141.00
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

William Optics 2x Barlow Nosepiece for Binoviewer

WO-E-BINO-B2
6 in stock

Provides 2x magnification Enables binoviewers to reach focus in most telescopes Standard 1.25" nosepiece format Threads directly onto the binoview...

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$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
$228.00 - $228.00
$228.00
$228.00 - $228.00
$228.00

William Optics 3.5"-2" RotoLock Visual Back Adapter

Options available

Adapts 3.5" William Optics focusers to a 2" receiver Features the secure, self-centering RotoLock mechanism Connects via M92 x 1 male threads Adds...

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$228.00 - $228.00
$228.00
$228.00 - $228.00
$228.00
William Optics 30mm Flattener Adapter
$58.00 - $58.00
$58.00
$58.00 - $58.00
$58.00

William Optics 30mm Flattener Adapter

WO-AD-M80TOM54

30mm Optical Length Connects M80 x 0.75 to M54 x 0.75 Threads For William Optics Flat68III & Flat7A Flatteners Description FAQ Specificatio...

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$58.00 - $58.00
$58.00
$58.00 - $58.00
$58.00
William Optics 4" Extender for FLT Series
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics 4" Extender for FLT Series

WO-P-M92EX

Adds 67 mm of optical length to your imaging train Features M92 male and female threads for a secure connection Designed for William Optics FLT 11...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics 4" Extension Tube for FLT Series

WO-P-EXFLT

4" extension tube designed for William Optics FLT Series Provides additional back focus for various optical setups ...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$110.00 - $110.00
$110.00
$110.00 - $110.00
$110.00

William Optics 45° Erecting Prism - 1.25"

WO-D-EP125
6 in stock

Provides a fully corrected image (upright and left-right correct) Comfortable 45° viewing angle for terrestrial observation Fits standard 1.25" fo...

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$110.00 - $110.00
$110.00
$110.00 - $110.00
$110.00
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

William Optics 48mm T-Mount for Canon

WO-TM-CN-EOS-M48
4 in stock

Connects M48 (2-inch) Threaded Correctors to Canon EOS Cameras Wide M48 Aperture Eliminates Vignetting on Full-Frame Sensors Adds a Precise 10.6 m...

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$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics 48mm T-Mount for Canon EOS R Mirrorless

WO-TM-CN-EOSR-M48
3 in stock

Connects M48-threaded correctors to Canon EOS R mirrorless cameras Wide 48mm aperture minimizes vignetting on full-frame sensors Precisely machine...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00

William Optics 48mm T-Mount for Fuji FX - Black

WO-TM-FJ-X-M48
1 in stock

Connects M48-threaded correctors to Fujifilm X-mount (Fuji FX) mirrorless cameras Wide 48mm aperture minimizes vignetting on APS-C sensors Precise...

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$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

William Optics 48mm T-Mount for Nikon F

WO-TM-NK-F-M48
2 in stock

Connects M48 Accessories to Nikon F-Mount Cameras Precisely machined 8.2 mm optical length achieves exact 55mm back focus when combined with camer...

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$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics 48mm T-Mount for Nikon Z

WO-TM-NK-Z-M48

Connects M48 accessories to Nikon Z-mount mirrorless cameras Precisely machined 38.4 mm optical length achieves exact 55mm back focus when combine...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$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

Connects Pentax K-Mount Cameras to M48 Accessories Precisely machined 9.3 mm optical length achieves exact 55mm back focus when combined with came...

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$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

Connects Sony E-mount cameras to M48 accessories Provides a precise 36.7 mm optical length M48 (female) threads reduce vignetting on large sensors...

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$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

50mm Aperture Doublet Lens 200mm Focal Length f/4.0 Focal Ratio 1.25" RotoLock Eyepiece Holder Total Weight: 0.42 kg / 0.93 lbs Description FAQ...

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$148.00 - $178.00
$148.00 - $178.00
$148.00 - $178.00
$148.00
William Optics 54mm Flattener Extender for GT81 WIFD
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics 54mm Flattener Extender for GT81 WIFD

WO-AD-M80-54-M48

Provides a precise 54mm of optical length Connects the FLAT68III flattener to M48 imaging trains Designed specifically for the William Optics Gran...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

William Optics 75mm -110mm Bahtinov Focusing Mask

WO-BM-DS-GR45

Fits Telescope Dew Shields from 75mm to 110mm Creates Sharp Diffraction Spikes for Precise Focusing Ideal for Small Apochromatic Refractors and As...

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$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
5 in stock

Provides a fully corrected, upright, and non-reversed image Designed for 1.25" focusers and eyepieces 90° viewing angle for comfortable observing ...

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$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

1.25" Barrel Diameter 99% Dielectric Coated Mirror 1/12λ Mirror Surface Accuracy 12mm Thick Mirror Substrate 100% Real Carbon Fiber Side Plates ...

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$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
3 in stock

2" Barrel with 90° Viewing Angle 99% Reflectivity Dielectric Coatings 1/12th Wave Precision Polished Mirror 12mm Thick Mirror Substrate for Therma...

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$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

1.0x Flattener Power Designed for William Optics Zenithstar 61 Full-Frame Sensor Coverage Adjustable Back Focus Mechanism M54 Telescope Thread &am...

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$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

0.8x Focal Reducer & Field Flattener Optimized for GT71, GT81, Z81 & Z103 Refractors Illuminates Full-Frame Sensors Adjustable Back Focus ...

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$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

Dedicated Field Flattener for the William Optics FLT91 Telescope Corrects Field Curvature for Pinpoint Stars Edge-to-Edge Integrated Adjustment Ri...

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$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

Designed specifically for the William Optics ZenithStar 73 APO Delivers a 1.0x, perfectly flat field across full-frame sensors Connects to the Z73...

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$278.00 - $278.00
$278.00
$278.00 - $278.00
$278.00