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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.

Optical Accessories

Filters

$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 ...

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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-T
4 in stock

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

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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

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

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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

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

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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

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

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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

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

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$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 ...

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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

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

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$284.00 - $284.00
$284.00
$284.00 - $284.00
$284.00
$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...

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$369.00 - $369.00
$369.00
$369.00 - $369.00
$369.00
$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00

William Optics Flattener 68III

WO-P-FLAT68III

Designed specifically for William Optics 68mm f/6 refractor telescopes Corrects field curvature for improved edge-to-edge sharpness De...

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$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00
$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00

William Optics RedCat WIFD Erecting Prism - 1.25"

WO-D-EP90-125-RC51III
1 in stock

1.25" erecting prism for correct image orientation Silver-finished design specifically for RedCat telescopes Description The W...

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$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics SPL 55° 12.5mm Eyepiece - 1.25"

WO-E-SPL12.5

1.25-inch eyepiece with 55° apparent field of view 12.5mm focal length for medium-high magnification viewing Description The W...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$478.00 - $478.00
$478.00
$478.00 - $478.00
$478.00

William Optics STC Astro Duo-Narrowband Filter

WO-YF-STC-ADN

Dual-bandpass filter for astrophotography Optimized for H-alpha and OIII emission lines Description The William Optics STC Ast...

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$478.00 - $478.00
$478.00
$478.00 - $478.00
$478.00
$238.00 - $238.00
$238.00
$238.00 - $238.00
$238.00

William Optics STC Ultra Layer Astro Multispectra Filter - 48mm

WO-YF-STC-M48

Multi-bandpass filter for astrophotography 48mm thread-on design for easy attachment Description The William Optics STC Ultra ...

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$238.00 - $238.00
$238.00
$238.00 - $238.00
$238.00
$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00

William Optics SWAN 72° 40mm Eyepiece - 2"

WO-E-SWA40
5 in stock

2-inch eyepiece with 72° apparent field of view 40mm focal length for wide-field, low-magnification viewing Description The Wi...

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$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00
$806.00 - $806.00
$806.00
$806.00 - $806.00
$806.00

William Optics WO x0.72 Reducer Flattener 8

WO-P-FLAT8

0.72x reducer/flattener for William Optics refractor telescopes Reduces focal length and corrects field curvature for improved astrophotogra...

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$806.00 - $806.00
$806.00
$806.00 - $806.00
$806.00
$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00

William Optics x0.8 Reducer Flattener 7A

WO-P-FLAT7A

0.8x reducer/flattener for William Optics refractor telescopes Reduces focal length while correcting field curvature Description ...

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$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00

ZWO 2.1mm 150° All-Sky Lens - For 1/3" Sensors

ZWO-LENS-2.1
1 in stock

2.1mm Focal Length 150° Field of View Optimized for 1/3" Format Sensors Functions as an All-Sky Camera Lens Standard CS-Mount Thread Descriptio...

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$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00

ZWO 2.5mm 170° All-Sky Lens - For 1/2" Sensors

ZWO-LENS-2-5
1 in stock

2.5mm Focal Length 170° All-Sky Field of View Designed for 1/2" Format Sensors CS-Mount Thread Description FAQ Specifications I...

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$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$15.00 - $39.00
$15.00 - $39.00
$15.00 - $39.00
$15.00

ZWO AR Protective Window

Options available
1 variants in stock

Protects camera sensor from dust and humidity 21mm diameter for specific ZWO camera models High-transmission Anti-Reflection (AR) coatings 1/4λ su...

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$15.00 - $39.00
$15.00 - $39.00
$15.00 - $39.00
$15.00
$128.00 - $128.00
$128.00
$128.00 - $128.00
$128.00

ZWO Atmospheric Dispersion Corrector

ZWO-ADC
3 in stock

Corrects atmospheric dispersion for sharper planetary images Uses two H-K9L prisms with 2° deviation angles Features 1/10 wave optical accuracy to...

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$128.00 - $128.00
$128.00
$128.00 - $128.00
$128.00
$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00

ZWO CH4 Methane Filter - 20nm 1.25"

ZWO-CH4
1 in stock

Reveals high-altitude detail on Jupiter and Saturn 20nm bandpass centered on the methane absorption line Standard 1.25" (31.75mm) threaded cell Re...

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$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00
$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00

ZWO CS Lens 2.8mm-12mm F1.4

ZWO-LENS-2.8-12
1 in stock

2.8mm to 12mm Zoom Focal Length Fast f/1.4 Aperture ~100° Wide Field of View Designed for 1/3" Format Sensors Standard CS-Mount Thread Descript...

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$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00
$79.00 - $149.00
$79.00 - $149.00
$79.00 - $149.00
$79.00

ZWO Duo-Band Filter

Options available
7 variants in stock

Passes H-Alpha (15nm) and OIII (35nm) Wavelengths Designed for One-Shot Color (OSC) Cameras 1.25" Threaded Cell Over 80% Ha & 90% OIII Transmi...

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$79.00 - $149.00
$79.00 - $149.00
$79.00 - $149.00
$79.00