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 5% Save %
CA$1,087.00
CA$1,087.00 - CA$1,087.00
CA$1,087.00
CA$1,033.00
CA$1,033.00 - CA$1,033.00
CA$1,033.00

William Optics x0.8 Reducer Flattener 7A

Reduces focal ratio by a factor of 0.8x Triplet lens design with 3 elements in 3 groups Corrects field curvature for full-frame sensors Designed f...

View full details
CA$1,087.00
CA$1,087.00 - CA$1,087.00
CA$1,087.00
CA$1,033.00
CA$1,033.00 - CA$1,033.00
CA$1,033.00
Save 5% Save %
Save 5% Save %
CA$962.00
CA$962.00 - CA$962.00
CA$962.00
CA$914.00
CA$914.00 - CA$914.00
CA$914.00

William Optics Zenithstar 61II APO

61mm Aperture Apochromatic Doublet Refractor Ohara FPL-53 ED Glass Element 360mm Focal Length (f/5.9) Includes Flat61A Field Flattener for Full-Fr...

View full details
CA$962.00
CA$962.00 - CA$962.00
CA$962.00
CA$914.00
CA$914.00 - CA$914.00
CA$914.00
Save 5% Save %
Save up to 5% Save %
CA$1,398.00 - CA$1,515.00
CA$1,398.00
CA$1,328.00 - CA$1,439.00
CA$1,328.00 - CA$1,439.00
CA$1,328.00

William Optics Zenithstar 81 WIFD Telescope

81mm Aperture, 559mm Focal Length (f/6.9) 2-Element APO Objective with FPL-53 Glass Patented William Optics Internal Focus Design (WIFD) Greater-t...

View full details
CA$1,398.00 - CA$1,515.00
CA$1,398.00
CA$1,328.00 - CA$1,439.00
CA$1,328.00 - CA$1,439.00
CA$1,328.00
Save up to 5% Save %
William Optics ZWO EAF Mounting Bracket with Clutch for WIFD Focusers
William Optics ZWO EAF Mounting Bracket with Clutch for WIFD Focusers Save 5% Save %
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
CA$259.00
CA$259.00 - CA$259.00
CA$259.00

William Optics ZWO EAF Mounting Bracket with Clutch for WIFD Focusers

Clutch mechanism for switching between manual and motorized focusing Two versions: one for the original ZWO EAF, one for the ZWO EAFN / EAF Pro Fi...

View full details
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
CA$259.00
CA$259.00 - CA$259.00
CA$259.00
Save 5% 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 12V 10A AC to DC Power Adapter

Output: 12V DC, 10A Maximum Power: 120W Input: 100-240V AC Connector: 5.5mm x 2.1mm Center-Positive Description FAQ Specifications In the Box W...

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 12% Save %
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
CA$36.00
CA$36.00 - CA$36.00
CA$36.00

ZWO 12V 5A AC to DC Power Adapter

Input Voltage: 100-240V AC Output: 12V DC at 5A Connector: 5.5mm x 2.1mm Center-Positive Compatibility: ASI Cooled Cameras, ASIAIR Pro, ASIAIR...

View full details
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
CA$36.00
CA$36.00 - CA$36.00
CA$36.00
Save 12% 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 160mm Pier Extension

Adds 160mm (6.30") of height for increased OTA clearance Designed for the ZWO AM5 mount Hollow, aircraft-grade aluminum construction for rigidity ...

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$22.00
CA$22.00 - CA$22.00
CA$22.00
CA$20.00
CA$20.00 - CA$20.00
CA$20.00

ZWO 2" to 1.25" Filter Adapter Ring

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...

View full details
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
CA$20.00
CA$20.00 - CA$20.00
CA$20.00
Save 9% Save %
Save 10% Save %
CA$31.00
CA$31.00 - CA$31.00
CA$31.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00

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

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...

View full details
CA$31.00
CA$31.00 - CA$31.00
CA$31.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00
Save 10% Save %
Save 10% Save %
CA$31.00
CA$31.00 - CA$31.00
CA$31.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00

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

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

View full details
CA$31.00
CA$31.00 - CA$31.00
CA$31.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00
Save 10% Save %
Save 9% Save %
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
CA$253.00 - CA$253.00
CA$253.00

ZWO 200mm Pier Extension

Adds 200mm of height to prevent OTA collisions Engineered specifically for the ZWO AM5 Mount Hollow, aircraft-grade aluminum construction Compatib...

View full details
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
CA$253.00 - CA$253.00
CA$253.00
Save 9% Save %
Save 10% Save %
CA$209.00
CA$209.00 - CA$209.00
CA$209.00
CA$188.00
CA$188.00 - CA$188.00
CA$188.00

ZWO 30mm f/5 APO Guide Scope

30mm Aperture 150mm Focal Length (f/5.0) Triplet Apochromatic (APO) Lens Design Precise Helical Focuser Lightweight at 0.77 lb. Description FAQ...

View full details
CA$209.00
CA$209.00 - CA$209.00
CA$209.00
CA$188.00
CA$188.00 - CA$188.00
CA$188.00
Save 10% 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 78mm Holder Ring

Securely mounts ZWO cooled cameras with a 78mm diameter body Locks with a single M6 screw on the side Mounting foot with two 1/4"-20 threaded hole...

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 %
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 90mm Holder Ring

Engineered for a precise 90 mm camera body diameter Official fit for ZWO ASI2600 and ASI6200 Pro Cooled Cameras Features two 1/4"-20 and six M4 th...

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 12% Save %
CA$17.00
CA$17.00 - CA$17.00
CA$17.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00

ZWO Adapter - 2mm M54(M)/M48(F)

Connects M54 Filter Wheels to M48 Accessories Adds Only 2 mm to Optical Path Maintains 55 mm Back Focus Standard Knurled Edge for Secure Grip Desi...

View full details
CA$17.00
CA$17.00 - CA$17.00
CA$17.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00
Save 12% Save %
Save 9% Save %
CA$2,099.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00
CA$1,902.00
CA$1,902.00 - CA$1,902.00
CA$1,902.00

ZWO AM3N Harmonic Equatorial Mount with TC40 Tripod

17.64 lb. payload capacity without counterweights 9.04 lb. mount head Dual Alt-Azimuth and Equatorial modes 0-90° latitude range for operation any...

View full details
CA$2,099.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00
CA$1,902.00
CA$1,902.00 - CA$1,902.00
CA$1,902.00
Save 9% Save %
Save 9% Save %
CA$2,799.00
CA$2,799.00 - CA$2,799.00
CA$2,799.00
CA$2,537.00
CA$2,537.00 - CA$2,537.00
CA$2,537.00

ZWO AM5N Harmonic Equatorial Mount with TC40 Tripod

Carries 33 lb. without counterweights 12.1 lb. lightweight mount head Dual Equatorial and Alt-Azimuth modes 0° to 90° latitude range for worldwide...

View full details
CA$2,799.00
CA$2,799.00 - CA$2,799.00
CA$2,799.00
CA$2,537.00
CA$2,537.00 - CA$2,537.00
CA$2,537.00
Save 9% Save %
Save 9% Save %
CA$3,499.00
CA$3,499.00 - CA$3,499.00
CA$3,499.00
CA$3,171.00
CA$3,171.00 - CA$3,171.00
CA$3,171.00

ZWO AM7 Harmonic Equatorial Mount with TC40 Tripod

44 lb. payload capacity without a counterweight 14.9 lb. mount head weight Dual Equatorial and Alt-Azimuth modes Stepper motor with 0.17" resoluti...

View full details
CA$3,499.00
CA$3,499.00 - CA$3,499.00
CA$3,499.00
CA$3,171.00
CA$3,171.00 - CA$3,171.00
CA$3,171.00
Save 9% 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 AMH Hand Controller

Allows to control AM3 & AM5 mounts Description In the Box ...

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 %
Save 11% Save %
CA$27.00
CA$27.00 - CA$27.00
CA$27.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00

ZWO Anti-Dew Heater Strip

Maintains a clear sensor window on ZWO ASI cooled cameras Consumes a minimal 4.2 watts of power Ultra-thin 0.2 mm to 0.3 mm profile for a non-intr...

View full details
CA$27.00
CA$27.00 - CA$27.00
CA$27.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00
Save 11% Save %
Save up to 10% Save %
CA$26.00 - CA$69.00
CA$26.00
CA$24.00 - CA$62.00
CA$24.00 - CA$62.00
CA$24.00

ZWO AR Protective Window

Protects camera sensor from dust and humidity 21mm, 25mm and 60mm sizes for specific ZWO camera models High-transmission Anti-Reflection (AR) coat...

View full details
CA$26.00 - CA$69.00
CA$26.00
CA$24.00 - CA$62.00
CA$24.00 - CA$62.00
CA$24.00
Save up to 10% Save %
Save 9% Save %
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
CA$253.00 - CA$253.00
CA$253.00

ZWO ASI120MM Mini Mono Guide Camera

1.2 Megapixel monochrome CMOS sensor (1280 x 960) 3.75µm pixel size for precise guiding and planetary detail Peak Quantum Efficiency of 80% for hi...

View full details
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$253.00
CA$253.00 - CA$253.00
CA$253.00
Save 9% Save %
Save 9% Save %
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 ASI174MM Mini Mono Guide Camera

Large 1/1.2" Sony CMOS Sensor 2.4 MP Resolution (1936 x 1216) 5.86µm Pixel Size 77% Peak Quantum Efficiency Standard 1.25" Body with ST-4 and USB ...

View full details
CA$559.00
CA$559.00 - CA$559.00
CA$559.00
CA$506.00
CA$506.00 - CA$506.00
CA$506.00
Save 9% Save %
Save 9% Save %
CA$699.00
CA$699.00 - CA$699.00
CA$699.00
CA$633.00
CA$633.00 - CA$633.00
CA$633.00

ZWO ASI174MM Mono

IMX174 Sensor Pixel Size of 5.86 microns QE of 77% USB 3.0 ...

View full details
CA$699.00
CA$699.00 - CA$699.00
CA$699.00
CA$633.00
CA$633.00 - CA$633.00
CA$633.00
Save 9% 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.