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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.

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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 ASI664MC Color

4.15 Megapixel Sony IMX664 Color CMOS Sensor 2.9µm Pixel Size 91% Peak Quantum Efficiency 95 FPS at Full Resolution 256MB DDR3 Internal Buffer Zer...

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CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$379.00
CA$379.00 - CA$379.00
CA$379.00
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CA$559.00
CA$559.00 - CA$559.00
CA$559.00
CA$506.00
CA$506.00 - CA$506.00
CA$506.00

ZWO ASI676MC Color

12.6 Megapixel 3552 x 3552 Square Sensor 2.0µm Pixel Size 83% Peak Quantum Efficiency Zero Amplifier Glow Circuitry 256MB DDR3 Internal Buffer ...

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CA$559.00
CA$559.00 - CA$559.00
CA$559.00
CA$506.00
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CA$506.00
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CA$699.00
CA$699.00 - CA$699.00
CA$699.00
CA$570.00
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CA$570.00

ZWO ASI676MM Mono Camera

12.6 MP Square Sensor (3552 x 3552) 2µm Pixel Size 83% Peak Quantum Efficiency 0.56e Ultra-Low Read Noise Zero Amplifier Glow Description FAQ S...

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CA$699.00
CA$699.00 - CA$699.00
CA$699.00
CA$570.00
CA$570.00 - CA$570.00
CA$570.00
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CA$419.00
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CA$379.00
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CA$379.00

ZWO ASI678MC Color

8.29 Megapixel Sony IMX678 Color Sensor 2.0µm pixels for high-resolution planetary imaging 47.5 FPS at full 3840x2160 resolution Zero amp glow for...

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CA$419.00
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CA$419.00
CA$379.00
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CA$489.00
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CA$489.00
CA$443.00
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CA$443.00

ZWO ASI678MM Mono

8.29 Megapixel Resolution (3840 x 2160) 2.0µm Square Pixels 83% Peak Quantum Efficiency (Monochrome) 0.6e Minimum Read Noise 47.5 Frames Per Secon...

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CA$489.00
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CA$489.00
CA$443.00
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CA$443.00
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CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
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CA$253.00

ZWO ASI715MC Color

3864x2192 Resolution Sony STARVIS Sensor 1.45µm Pixel Size for High-Resolution Planetary Imaging 45.1 FPS at Full Resolution over USB 3.0 Peak Qua...

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CA$279.00
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CA$279.00
CA$253.00
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CA$253.00
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CA$209.00
CA$209.00 - CA$209.00
CA$209.00
CA$188.00
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CA$188.00

ZWO Atmospheric Dispersion Corrector

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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CA$209.00
CA$209.00 - CA$209.00
CA$209.00
CA$188.00
CA$188.00 - CA$188.00
CA$188.00
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CA$559.00
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CA$559.00
CA$503.00
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CA$503.00

ZWO CAA Rotator

Motorized rotation with 0.02° step resolution Adds only 16.5 mm of backfocus 48 mm clear aperture for full-frame sensors ASCOM and ASIAIR compatib...

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CA$559.00
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CA$559.00
CA$503.00
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CA$503.00
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CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$125.00
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CA$125.00

ZWO CH4 Methane Filter - 20nm 1.25"

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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CA$139.00
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CA$139.00
CA$125.00
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CA$125.00
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CA$55.00
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CA$55.00
CA$49.00
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CA$49.00

ZWO Counterweight Bar for AM5 Mount

Extends AM5 mount payload capacity beyond 28 lbs 230 mm (9") total length for flexible balancing Standard 0.787" (20 mm) diameter fits common coun...

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CA$55.00
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CA$55.00
CA$49.00
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CA$49.00
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CA$53.00
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CA$53.00
CA$48.00
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CA$48.00

ZWO CS Lens 2.8mm-12mm F1.4

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

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CA$53.00
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CA$53.00
CA$48.00
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CA$48.00
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CA$27.00
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CA$27.00
CA$24.00
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CA$24.00

ZWO Desiccant Tablets

Maintains a dew-free sensor chamber Factory-original replacement for all ZWO cooled cameras Includes four desiccant tablets User-replaceable to re...

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CA$27.00
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CA$27.00
CA$24.00
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CA$24.00
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CA$139.00 - CA$239.00
CA$139.00
CA$125.00 - CA$213.00
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CA$125.00

ZWO Duo-Band Filter

Passes H-Alpha (15nm) and OIII (35nm) Wavelengths Designed for One-Shot Color (OSC) Cameras 1.25" or 2" Threaded Cell Over 80% Ha & 90% OIII T...

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CA$139.00 - CA$239.00
CA$139.00
CA$125.00 - CA$213.00
CA$125.00 - CA$213.00
CA$125.00
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CA$69.00
CA$69.00 - CA$69.00
CA$69.00
CA$62.00
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CA$62.00

ZWO EAF Bracket for Celestron C11/C14

Connects a ZWO EAF directly to Celestron C11 and C14 telescopes Bypasses the stock manual focuser for a direct-drive connection Includes flexible ...

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CA$69.00
CA$69.00 - CA$69.00
CA$69.00
CA$62.00
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CA$62.00
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CA$69.00
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CA$69.00
CA$62.00
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CA$62.00

ZWO EAF Bracket for Celestron C8/C9.25

Connects a ZWO EAF to Celestron 8" and 9.25" SCT, EdgeHD, and RASA OTAs Enables precise, automated focusing for astrophotography Includes both 5 m...

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CA$69.00
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CA$69.00
CA$62.00
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CA$62.00
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CA$55.00
CA$55.00 - CA$55.00
CA$55.00
CA$49.00
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CA$49.00

ZWO EAF Bracket for Takahashi

Precision-machined for Takahashi focusers Includes both 4 mm and 5 mm flexible couplers Supports Takahashi FS-60, FSQ-85, FSQ-106 and TSA-120 focu...

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CA$55.00
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CA$55.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
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CA$56.00
CA$56.00 - CA$56.00
CA$56.00
CA$51.00
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CA$51.00

ZWO EAF Hand Controller

Precise, tactile focus control for ZWO EAF Operate focuser without a computer or ASIAIR Variable speed for coarse and fine adjustments Ideal for v...

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CA$56.00
CA$56.00 - CA$56.00
CA$56.00
CA$51.00
CA$51.00 - CA$51.00
CA$51.00
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CA$419.00
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CA$419.00
CA$379.00
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CA$379.00

ZWO EAF Pro Wireless Electronic Automatic Focuser

11 lb (5kg) Payload Capacity Bluetooth 5.0 and USB-C Connectivity Integrated Rechargeable Lithium Battery Stepper Motor with 128:1 Gear Ratio High...

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CA$419.00
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CA$419.00
CA$379.00
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CA$379.00
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CA$14.00
CA$14.00 - CA$14.00
CA$14.00
CA$13.00
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CA$13.00

ZWO EAF Temperature Sensor

Enables temperature-based autofocus compensation for the ZWO EAF Plugs directly into the ZWO Electronic Automatic Focuser Maintains sharp focus as...

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CA$14.00
CA$14.00 - CA$14.00
CA$14.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00
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CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
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CA$253.00

ZWO EAFN Electronic Automatic Focuser

Handles imaging payloads up to 11 lbs (5kg) High-precision stepper motor with 128:1 gear ratio Single USB-C port for power and data ASCOM, INDI, a...

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CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
CA$253.00 - CA$253.00
CA$253.00
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CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
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CA$253.00

ZWO Electronic Filter Wheel EFW Gen2 - 5 x 1.25"

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$253.00
CA$253.00 - CA$253.00
CA$253.00
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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 - 5 x 2"

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$379.00
CA$379.00 - CA$379.00
CA$379.00
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CA$559.00
CA$559.00 - CA$559.00
CA$559.00
CA$506.00
CA$506.00 - CA$506.00
CA$506.00

ZWO Electronic Filter Wheel EFW Gen2 - 7 x 2"

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$506.00
CA$506.00 - CA$506.00
CA$506.00
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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 - 7 x 36mm

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$379.00
CA$379.00 - CA$379.00
CA$379.00
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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.