Skip to content
Price match 30-day returns* Talk to an astronomer before you buy

Sales & Clearance

Astronomy sales at David Astro, current markdowns across the catalogue, including open-box units, discontinued models still fully supported, and overstock we would rather see on a telescope than on a shelf. Everything here is held in Canadian stock and carries the same warranty and support as full-price inventory.

Reduced price does not mean reduced service. We will still calculate your back-focus, confirm compatibility and support the item after the sale, exactly as we would for anything else in the catalogue.

Filters

Save 10% Save %
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$379.00
CA$379.00 - CA$379.00
CA$379.00

ZWO Electronic Filter Wheel EFW Gen2 - 8 x 1.25"

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...

View full details
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$379.00
CA$379.00 - CA$379.00
CA$379.00
Save 10% Save %
Save 11% Save %
CA$83.00
CA$83.00 - CA$83.00
CA$83.00
CA$74.00
CA$74.00 - CA$74.00
CA$74.00

ZWO EOS Lens Adapter for 2" EFW

Connects Canon EOS lenses to a ZWO 2" Electronic Filter Wheel M54x0.75 male thread that threads directly into the 2" EFW Enables filtered, wide-fi...

View full details
CA$83.00
CA$83.00 - CA$83.00
CA$83.00
CA$74.00
CA$74.00 - CA$74.00
CA$74.00
Save 11% Save %
Save 10% Save %
CA$69.00
CA$69.00 - CA$69.00
CA$69.00
CA$62.00
CA$62.00 - CA$62.00
CA$62.00

ZWO EOS Lens Adapter for EFW

Connects Canon EF lenses to ZWO Electronic Filter Wheels (EFW); EF-S lenses are not supported Engineered for ZWO cameras with 6.5mm back focus (e....

View full details
CA$69.00
CA$69.00 - CA$69.00
CA$69.00
CA$62.00
CA$62.00 - CA$62.00
CA$62.00
Save 10% Save %
ZWO FF110 APO Refractor w/ AM5N Astrophotography Bundle
ZWO FF110 APO Refractor w/ AM5N Astrophotography Bundle Save 19% Save %
CA$6,084.00
CA$6,084.00 - CA$6,084.00
CA$6,084.00
CA$4,939.00
CA$4,939.00 - CA$4,939.00
CA$4,939.00

ZWO FF110 APO Refractor w/ AM5N Astrophotography Bundle

Telescope: ZWO FF110-APO 110mm f/7 Quadruplet Refractor Image Circle: 44mm, covers full-frame sensors natively Mount: ZWO AM5N Harmonic Drive E...

View full details
CA$6,084.00
CA$6,084.00 - CA$6,084.00
CA$6,084.00
CA$4,939.00
CA$4,939.00 - CA$4,939.00
CA$4,939.00
Save 19% Save %
ZWO FF110 APO Refractor w/ AM7 Astrophotography Bundle
ZWO FF110 APO Refractor w/ AM7 Astrophotography Bundle
Save 20% Save %
CA$7,064.00
CA$7,064.00 - CA$7,064.00
CA$7,064.00
CA$5,639.00
CA$5,639.00 - CA$5,639.00
CA$5,639.00

ZWO FF110 APO Refractor w/ AM7 Astrophotography Bundle

ZWO FF110-APO 110mm f/7 Quadruplet Refractor ZWO AM7 Harmonic Drive Mount with 44 lb. Counterweight-Free Payload ZWO TC40 Carbon Fiber Tripod with...

View full details
CA$7,064.00
CA$7,064.00 - CA$7,064.00
CA$7,064.00
CA$5,639.00
CA$5,639.00 - CA$5,639.00
CA$5,639.00
Save 20% Save %
Save 10% Save %
CA$2,109.00
CA$2,109.00 - CA$2,109.00
CA$2,109.00
CA$1,902.00
CA$1,902.00 - CA$1,902.00
CA$1,902.00

ZWO FF110-APO 110mm Quadruplet Refractor F/7.0

110mm Aperture 766mm Focal Length (f/7) 4-Element Apochromatic Optics 44mm Corrected Image Circle 3-inch Dual-Speed Rack & Pinion Focuser 14.9...

View full details
CA$2,109.00
CA$2,109.00 - CA$2,109.00
CA$2,109.00
CA$1,902.00
CA$1,902.00 - CA$1,902.00
CA$1,902.00
Save 10% Save %
ZWO FF131 APO Refractor w/ AM5N Astrophotography Bundle
ZWO FF131 APO Refractor w/ AM5N Astrophotography Bundle
Save 17% Save %
CA$6,784.00
CA$6,784.00 - CA$6,784.00
CA$6,784.00
CA$5,639.00
CA$5,639.00 - CA$5,639.00
CA$5,639.00

ZWO FF131 APO Refractor w/ AM5N Astrophotography Bundle

Telescope: 131mm f/7.5 Quadruplet Apochromatic Refractor Image Circle: 44mm native flat-field, full-frame coverage Mount: AM5N Harmonic Drive w...

View full details
CA$6,784.00
CA$6,784.00 - CA$6,784.00
CA$6,784.00
CA$5,639.00
CA$5,639.00 - CA$5,639.00
CA$5,639.00
Save 17% Save %
ZWO FF131 APO Refractor w/ AM7 Astrophotography Bundle
ZWO FF131 APO Refractor w/ AM7 Astrophotography Bundle
Save 18% Save %
CA$7,764.00
CA$7,764.00 - CA$7,764.00
CA$7,764.00
CA$6,349.00
CA$6,349.00 - CA$6,349.00
CA$6,349.00

ZWO FF131 APO Refractor w/ AM7 Astrophotography Bundle

Telescope: ZWO FF131 APO 131mm f/7.5 Quadruplet Refractor Image Circle: 44mm, corrected for full-frame sensors Mount: ZWO AM7 Strain-Wave GoTo ...

View full details
CA$7,764.00
CA$7,764.00 - CA$7,764.00
CA$7,764.00
CA$6,349.00
CA$6,349.00 - CA$6,349.00
CA$6,349.00
Save 18% Save %
Save 10% Save %
CA$2,819.00
CA$2,819.00 - CA$2,819.00
CA$2,819.00
CA$2,537.00
CA$2,537.00 - CA$2,537.00
CA$2,537.00

ZWO FF131-APO 131mm Quadruplet Refractor F/7.5

131mm (5.15") Aperture 983mm Focal Length (f/7.5) 4-Element Quadruplet Apochromatic Optics 44mm Flat-Field Image Circle 3" Dual-Speed Rack & P...

View full details
CA$2,819.00
CA$2,819.00 - CA$2,819.00
CA$2,819.00
CA$2,537.00
CA$2,537.00 - CA$2,537.00
CA$2,537.00
Save 10% Save %
ZWO FF70 APO Refractor w/ AM3N Astrophotography Bundle
ZWO FF70 APO Refractor w/ AM3N Astrophotography Bundle
Save 17% Save %
CA$3,564.00
CA$3,564.00 - CA$3,564.00
CA$3,564.00
CA$2,959.00
CA$2,959.00 - CA$2,959.00
CA$2,959.00

ZWO FF70 APO Refractor w/ AM3N Astrophotography Bundle

Complete astrophotography bundle including telescope, mount, tripod, and pier extension ZWO FF70 APO: 70mm f/7 quadruplet refractor with a native ...

View full details
CA$3,564.00
CA$3,564.00 - CA$3,564.00
CA$3,564.00
CA$2,959.00
CA$2,959.00 - CA$2,959.00
CA$2,959.00
Save 17% Save %
Save 10% Save %
CA$849.00
CA$849.00 - CA$849.00
CA$849.00
CA$760.00
CA$760.00 - CA$760.00
CA$760.00

ZWO FF70-APO 70mm Quadruplet Refractor F/7.0

70mm Aperture 490mm Focal Length (f/7) 4-Element Quadruplet Apochromatic Optics 44mm Full-Frame Image Circle Native Flat-Field Design 2.4" Dual-Sp...

View full details
CA$849.00
CA$849.00 - CA$849.00
CA$849.00
CA$760.00
CA$760.00 - CA$760.00
CA$760.00
Save 10% Save %
ZWO FF90 APO Refractor w/ AM3N Astrophotography Bundle
ZWO FF90 APO Refractor w/ AM3N Astrophotography Bundle
Save 14% Save %
CA$4,124.00
CA$4,124.00 - CA$4,124.00
CA$4,124.00
CA$3,529.00
CA$3,529.00 - CA$3,529.00
CA$3,529.00

ZWO FF90 APO Refractor w/ AM3N Astrophotography Bundle

Telescope: ZWO FF90 90mm f/6.8 Quadruplet APO Refractor Mount: ZWO AM3N Harmonic Drive GoTo Mount Tripod: ZWO TC40 Carbon Fiber Tripod Pier Ex...

View full details
CA$4,124.00
CA$4,124.00 - CA$4,124.00
CA$4,124.00
CA$3,529.00
CA$3,529.00 - CA$3,529.00
CA$3,529.00
Save 14% Save %
Save 10% Save %
CA$1,409.00
CA$1,409.00 - CA$1,409.00
CA$1,409.00
CA$1,268.00
CA$1,268.00 - CA$1,268.00
CA$1,268.00

ZWO FF90-APO 90mm Quadruplet Refractor F/6.8

90mm Aperture 609mm Focal Length (f/6.8) 4-Element Quadruplet Optical Design 44mm Full-Frame Image Circle 3" Dual-Speed Rack & Pinion Focuser ...

View full details
CA$1,409.00
CA$1,409.00 - CA$1,409.00
CA$1,409.00
CA$1,268.00
CA$1,268.00 - CA$1,268.00
CA$1,268.00
Save 10% Save %
Save 9% Save %
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$126.00
CA$126.00 - CA$126.00
CA$126.00

ZWO Filter Drawer for EOS Lens

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...

View full details
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$126.00
CA$126.00 - CA$126.00
CA$126.00
Save 9% Save %
Save 9% Save %
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$126.00
CA$126.00 - CA$126.00
CA$126.00

ZWO Filter Drawer for Nikon Lens

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...

View full details
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$126.00
CA$126.00 - CA$126.00
CA$126.00
Save 9% Save %
Save 10% Save %
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$100.00
CA$100.00 - CA$100.00
CA$100.00

ZWO Filter Drawer V2 - M42

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...

View full details
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$100.00
CA$100.00 - CA$100.00
CA$100.00
Save 10% Save %
Save 10% Save %
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$100.00
CA$100.00 - CA$100.00
CA$100.00

ZWO Filter Drawer V2 - M54

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

View full details
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$100.00
CA$100.00 - CA$100.00
CA$100.00
Save 10% Save %
Save 10% Save %
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
CA$44.00
CA$44.00 - CA$44.00
CA$44.00

ZWO Filter Holder V2

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

View full details
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
CA$44.00
CA$44.00 - CA$44.00
CA$44.00
Save 10% Save %
Save up to 10% Save %
CA$17.00 - CA$21.00
CA$17.00
CA$15.00 - CA$19.00
CA$15.00 - CA$19.00
CA$15.00

ZWO Filter Masks

Securely Mounts Unmounted Filters Sets for ZWO 7x36mm, 8x1.25", 2" and Mini EFWs Includes M2 Mounting Screws Prevents Internal Light Leaks Desc...

View full details
CA$17.00 - CA$21.00
CA$17.00
CA$15.00 - CA$19.00
CA$15.00 - CA$19.00
CA$15.00
Save up to 10% Save %
Save 10% Save %
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
CA$87.00
CA$87.00 - CA$87.00
CA$87.00

ZWO Helical Focuser - 1.25"

1.25" non-rotating helical focuser 6mm of precise focus travel 0.1mm adjustment accuracy M42 female threads for direct OAG attachment Maintains gu...

View full details
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
CA$87.00
CA$87.00 - CA$87.00
CA$87.00
Save 10% Save %
Save 10% Save %
CA$40.00
CA$40.00 - CA$40.00
CA$40.00
CA$36.00
CA$36.00 - CA$36.00
CA$36.00

ZWO IR 850nm Pass Filter – 1.25"

Passes Infrared Light > 850nm Dramatically Steadies Planetary Views in Poor Seeing Enables Daylight Planetary and Lunar Imaging Standard 1.25" ...

View full details
CA$40.00
CA$40.00 - CA$40.00
CA$40.00
CA$36.00
CA$36.00 - CA$36.00
CA$36.00
Save 10% Save %
Save 8% Save %
CA$26.00
CA$26.00 - CA$26.00
CA$26.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00

ZWO IR-Cut Protective Window

21 mm or 25 mm diameter protective window for select ZWO cameras Integrated UV/IR-Cut filter maintains natural color balance 1/4 λ surface flatnes...

View full details
CA$26.00
CA$26.00 - CA$26.00
CA$26.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00
Save 8% Save %
Save up to 10% Save %
CA$207.00 - CA$419.00
CA$207.00
CA$186.00 - CA$377.00
CA$186.00 - CA$377.00
CA$186.00

ZWO LRGB Optimized Filters

1.25" and 2" Mounted or 36mm Unmounted Sets Greater than 92% Transmission at Passband Balanced 1:1:1 RGB Exposure Weighting 1/4 Wavefront Polished...

View full details
CA$207.00 - CA$419.00
CA$207.00
CA$186.00 - CA$377.00
CA$186.00 - CA$377.00
CA$186.00
Save up to 10% Save %
Save 12% Save %
CA$25.00
CA$25.00 - CA$25.00
CA$25.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00

ZWO M42 Extension - 21mm

Adds exactly 21mm of spacing to an M42 optical train M42x0.75 female threads on one side, male threads on the other Machined aluminum with a black...

View full details
CA$25.00
CA$25.00 - CA$25.00
CA$25.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
Save 12% Save %

What Goes on Sale and Why

Understanding why an item is discounted helps you judge whether it is the right purchase, so we are explicit about the reason wherever we can be.

  • Open-box and display units: Returned or demonstrated equipment that has been inspected and tested here, typically indistinguishable from new in use.
  • Superseded models: Products replaced by a newer revision, often with only minor changes and full parts and warranty support remaining.
  • Overstock: Items we hold more of than current demand justifies, discounted while the stock lasts.
  • Seasonal accessories: Dew control, cases and cold-weather items that move seasonally and are reduced outside their peak.
  • End-of-line accessories: Adapters, rings and small parts from lines being retired, which remain perfectly serviceable.
  • Used equipment: Our separate collection of tested second-hand gear, for buyers comfortable with pre-owned optics and mounts.

Why Choose David Astro for Discounted Astronomy Gear

A discount is only a good deal if the item is right for your setup and stays supported afterwards.

  • Compatibility checked before you commit: We will confirm a sale item actually fits your telescope or mount, because a bargain adapter that does not fit is not a bargain.
  • Condition stated honestly: Open-box and display items are described as what they are, with any cosmetic marks noted.
  • Full warranty on new items: Discounted new stock carries the same manufacturer warranty as anything else we sell, handled domestically.
  • Same support after the sale: Setup help, spacing calculations and in-house diagnostics apply to discounted purchases too.

Astronomy Sales in Canada: Frequently Asked Questions

Do sale items carry a warranty?

New discounted items carry the full manufacturer warranty. Open-box items are covered as stated on the listing, and we handle any claim domestically rather than routing it internationally.

Is an open-box item risky?

Not in our experience. Everything is inspected and functionally tested here before it is relisted, and anything with a cosmetic mark is described. Optics are checked for coating condition and collimation.

Can I still get support on a discontinued model?

Generally yes. We stock spare parts and adapters for many superseded models, and we say on the listing where parts availability is limited.

How long do sale prices last?

Until the stock is gone. These are finite quantities rather than a recurring promotion, so an item that disappears from this collection has usually sold rather than returned to full price.

Found something here?

Ask us before you order and we will confirm it fits your setup. Canadian stock, full support.