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Closed October 10–12 for Thanksgiving weekend
Closed October 10–12 for Thanksgiving weekend

Filter Wheels

A filter wheel is what makes monochrome imaging practical. Without one, every channel change means touching the telescope, breaking focus and losing framing; with one, the sequence runs unattended all night while you sleep. David Astro carries filter wheels in Canada in manual and motorized designs across the common filter sizes, held in our Canadian warehouse.

Wheel choice is constrained by your filter size, your camera and the back-focus you have available. Send us all three and we will specify the combination.

Filters

SVBONY SV133 2" 5-Position Filter Wheel for Deep Sky Astrophotography
CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00

SVBONY SV133 5-Position Filter Wheel - 2"

SV-W9103B

Accommodates five 2-inch filters 2-inch barrel for telescope connection 2-inch eyepiece and camera compatibility Enables rapid filter changes duri...

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CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00
SVBONY SV226 M42 Filter Drawer
CA$60.00 - CA$60.00
CA$60.00
CA$60.00 - CA$60.00
CA$60.00

SVBONY SV226 M42 Telescope Filter Drawer

SV-W9184A

Magnetic drawer for rapid filter changes CNC-molded integrated body for light-leak prevention Native M42x0.75 threads for common cameras and reduc...

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CA$60.00 - CA$60.00
CA$60.00
CA$60.00 - CA$60.00
CA$60.00
SVBONY Filter Drawer for OAG | SVBONY SV226P
CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00

SVBONY SV226P Telescope Filter Drawer for Off-Axis Guider (OAG)

SV-W9184D
1 in stock

Supports both 1.25" and 2" filters in one drawer 12-point M2.5 threaded mounting for guide camera stability Includes M42, M48, and M28.5 threads f...

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CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00
Wanderer Astro SFW50/SFW50S Filter Shim for 50mm Filters thinner than 2.5mm
CA$25.00 - CA$25.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00

Wanderer Astro Filter Shim for 50mm Filters

WA-WSFW50-FS

Designed for SFW50 & SFW50S Filter Wheels Adapts 50mm Unmounted Filters Thinner than 2.5mm Ensures Accurate and Stable Filter Seating Prevents...

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CA$25.00 - CA$25.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00
Wanderer Astro Snowflake Filter Wheel - 8 x 36mm Super Low-Profile
CA$517.00 - CA$517.00
CA$517.00
CA$517.00 - CA$517.00
CA$517.00

Wanderer Astro Snowflake Filter Wheel - 8 x 36mm Super Low-Profile

WA-WSFW36S

Holds 8 x 36mm unmounted filters Ultra-low profile design, as thin as 14mm Gear-driven mechanism with anti-backlash for repeatability Dedicated 8t...

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CA$517.00 - CA$517.00
CA$517.00
CA$517.00 - CA$517.00
CA$517.00
Wanderer Astro Snowflake Filter Wheel - 8 x 50mm Super Low-Profile
CA$769.00 - CA$769.00
CA$769.00
CA$769.00 - CA$769.00
CA$769.00

Wanderer Astro Snowflake Filter Wheel - 8 x 50mm Super Low-Profile

WA-WSFW50S

Accommodates 8 x 50mm unmounted filters Ultra low-profile body for systems with limited back focus Gear-driven mechanism with anti-backlash for re...

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CA$769.00 - CA$769.00
CA$769.00
CA$769.00 - CA$769.00
CA$769.00
Wanderer Astro Snowflake Filter Wheel - 8 x 50mm/2"
CA$657.00 - CA$657.00
CA$657.00
CA$657.00 - CA$657.00
CA$657.00

Wanderer Astro Snowflake Filter Wheel - 8 x 50mm/2"

WA-WSFW50

Accommodates 8 x 50mm round (or 2" mounted) filters Ultra low-profile design for tight back focus requirements Gear-driven with anti-backlash mech...

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CA$657.00 - CA$657.00
CA$657.00
CA$657.00 - CA$657.00
CA$657.00
CA$543.00 - CA$543.00
CA$543.00
CA$543.00 - CA$543.00
CA$543.00

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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CA$543.00 - CA$543.00
CA$543.00
CA$543.00 - CA$543.00
CA$543.00
CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00

ZWO 2" to 1.25" Filter Adapter Ring

ZWO-2-1.25FL
7 in stock

Adapts 1.25" mounted filters for use in 2" filter holders Compatible with ZWO 5-position and 7-position 2" filter wheels Fits ZWO M42 and M54 filt...

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CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
CA$849.00 - CA$849.00
CA$849.00
CA$849.00 - CA$849.00
CA$849.00

ZWO EFW - 7 x 50mm Square Filter Wheel

ZWO EFW-7x50

Holds seven 50mm square unmounted filters Designed for large-format sensors like the ZWO ASI461MM Pro Direct bolt-on connection for maximum rigidi...

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CA$849.00 - CA$849.00
CA$849.00
CA$849.00 - CA$849.00
CA$849.00
CA$335.00 - CA$335.00
CA$335.00
CA$335.00 - CA$335.00
CA$335.00

ZWO EFW - 8 x 1.25" or 31mm

ZWO-EFW-8x1.25
Only 1 left!

For 1.25" or 31mm filters Easy to install on the telescope and the camera Filters are easy to ins...

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CA$335.00 - CA$335.00
CA$335.00
CA$335.00 - CA$335.00
CA$335.00
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00

ZWO Electronic Filter Wheel EFW Gen2 - 5 x 1.25"

ZWO-EFW-5x1.25-25
3 in stock

5 filter positions for 1.25" or 31mm filters Adds 20 mm of back focus to the imaging train USB-C powered and controlled Redesigned housing for imp...

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CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

ZWO Electronic Filter Wheel EFW Gen2 - 5 x 2"

ZWO-EFW-5x2-25
6 in stock

Holds 5 x 2" mounted or 50mm unmounted filters Adds only 20 mm of back focus to the imaging train Stepper motor for precise, repeatable filter sel...

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CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$559.00 - CA$559.00
CA$559.00
CA$559.00 - CA$559.00
CA$559.00

ZWO Electronic Filter Wheel EFW Gen2 - 7 x 2"

ZWO-EFW-7x2-25
3 in stock

Holds seven 2" mounted or 50mm unmounted filters Adds 20 mm of back focus to the imaging train Stepper motor for precise, quiet filter selection S...

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CA$559.00 - CA$559.00
CA$559.00
CA$559.00 - CA$559.00
CA$559.00
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

ZWO Electronic Filter Wheel EFW Gen2 - 7 x 36mm

ZWO-EFW-7x36-25
2 in stock

Houses seven 36mm unmounted filters Adds a minimal 20mm of back focus to the imaging train 7-position carousel for LRGB, narrowband, or custom set...

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CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

ZWO Electronic Filter Wheel EFW Gen2 - 8 x 1.25"

ZWO-EFW-8x1.25-25
5 in stock

Holds 8 x 1.25" mounted or 31mm unmounted filters Adds 20 mm of back focus to the imaging train USB-powered stepper motor for precise filter selec...

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CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

ZWO Filter Drawer for EOS Lens

ZWO-FD-EOS
10 in stock

Connects Canon EOS lenses to ZWO ASI cameras Accepts standard 2" mounted filters Magnetic holder for secure, fast filter changes Adds 26.5mm of op...

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CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

ZWO Filter Drawer for Nikon Lens

ZWO-FD-NIKON
10 in stock

Adapts Nikon lenses to ZWO ASI cooled cameras Accepts standard 2-inch (M48x0.75 thread) mounted filters Ultra-thin 29 mm profile maintains focus I...

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CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

ZWO Filter Drawer V2 - M42

ZWO-FD-M42-II
47 in stock

Accepts standard 2-inch mounted filters Adds a precise 21mm to the optical path M42 x 0.75 male threads on the camera side M48 x 0.75 female threa...

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CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

ZWO Filter Drawer V2 - M54

ZWO-FD-M54-II
20 in stock

Connects to M54 x 0.75 threaded accessories Accepts standard 2" mounted filters Magnetic holder for quick filter changes Adjustable tension screw ...

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CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

ZWO Filter Holder V2

ZWO-F-HLDR
27 in stock

Holds standard 2-inch (50.8mm) mounted filters M48x0.75 internal threads for secure filter mounting Enables pre-loading multiple filters for rapid...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
CA$17.00 - CA$21.00
CA$17.00 - CA$21.00
CA$17.00 - CA$21.00
CA$17.00

ZWO Filter Masks

Options available
5 variants in stock

Securely Mounts 36mm Unmounted Filters Compatible with All 7-Position ZWO 36mm EFWs Includes M2 Mounting Screws Prevents Internal Light Leaks D...

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CA$17.00 - CA$21.00
CA$17.00 - CA$21.00
CA$17.00 - CA$21.00
CA$17.00
CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00

ZWO T2-1.25" Filter Adapter

ZWO-T2-1.25-3
8 in stock

Connects M42 (T2) threaded cameras to 1.25" filters Adds only 1 mm of optical length to the imaging train Maintains critical back focus for correc...

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CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00

Choosing a Filter Wheel

Three specifications determine whether a wheel works in your system: filter size and count, optical thickness, and how it integrates with your camera and guider.

  • Filter size and position count: More positions means fewer swaps, but a larger wheel diameter and often greater thickness. Five to seven positions covers LRGB plus narrowband for most imagers.
  • Optical thickness: The wheel consumes back-focus, and this must be included in your corrector spacing calculation. Slim designs exist specifically to conserve it.
  • Mounted versus unmounted filters: Wheels are built for one or the other. Unmounted square filters maximize clear aperture for large sensors but need a compatible carrier.
  • Motorized versus manual: Motorized wheels are essential for unattended sequences. Manual wheels are cheaper and adequate if you are present and refocusing anyway.
  • Off-axis guider integration: Many wheels accept an integrated off-axis guider, keeping the train short and the guide star picked off ahead of the filters.
  • Vignetting geometry: Filter size must suit sensor diagonal and the distance from filter to sensor. Too small and the corners darken regardless of the optics.

Why Choose David Astro for Filter Wheels

A filter wheel is a back-focus decision as much as a convenience one.

  • Thickness included in the calculation: We provide a complete spacing list with the wheel accounted for, so your corrector still lands on its design distance.
  • Filter size verified against your sensor: We calculate the size needed to avoid vignetting rather than assuming the nominal match is adequate.
  • Off-axis guider planned together: If you will need one at your focal length, we specify it with the wheel so the geometry works out the first time.
  • Authorized dealer: Genuine wheels with manufacturer warranty, in Canadian stock.
  • Ships from Canada: No duties or brokerage fees for Canadian orders.

Filter Wheels in Canada — Frequently Asked Questions

How many filter positions do I need?
Five covers LRGB plus one narrowband. Seven covers LRGB plus Ha, OIII and SII, which is the complete common set and avoids ever swapping filters by hand.
What filter size should I use?
It depends on sensor diagonal and how far the filter sits from the sensor. 36 mm typically suits APS-C in a standard wheel; full frame usually needs 50 mm square or unmounted 2 inch.
Does the wheel affect my back-focus?
Yes, significantly — often 20 mm or more of the typical 55 mm budget. It must be included in the calculation along with the camera and any off-axis guider.
Manual or motorized?
Motorized if you run unattended sequences, which is most of the point of monochrome imaging. Manual is a reasonable economy only if you are at the telescope throughout the session.

Building a mono imaging train?

Send us your camera, filters and corrector and we will specify the wheel and spacing. Full warranty, shipped from Canada.