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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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Explore Scientific Galileoscope Refractor Telescope STEM Kit Save 29% Save %
CA$35.00
CA$35.00 - CA$35.00
CA$35.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00

Explore Scientific Galileoscope Refractor Telescope STEM Kit

Hands-On Telescope Assembly: Build a functional refractor telescope from the ground up. No Tools Required: All components snap together in minut...

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CA$35.00
CA$35.00 - CA$35.00
CA$35.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00
Save 29% Save %
Explore Scientific Galileoscope Tripod Save 19% Save %
CA$42.00
CA$42.00 - CA$42.00
CA$42.00
CA$34.00
CA$34.00 - CA$34.00
CA$34.00

Explore Scientific Galileoscope Tripod

Convertible Tabletop to Full-Height Legs Smooth Panhandle Motion Control Lightweight, Portable Design Secure Mount for the Galileoscope Standard 1...

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CA$42.00
CA$42.00 - CA$42.00
CA$42.00
CA$34.00
CA$34.00 - CA$34.00
CA$34.00
Save 19% Save %
Explore Scientific Giant Binoculars Finder Adapter Save 21% Save %
CA$28.00
CA$28.00 - CA$28.00
CA$28.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00

Explore Scientific Giant Binoculars Finder Adapter

Attaches a Finder Scope Base to Explore Scientific Giant Binoculars Enables Accurate Pointing and Target Acquisition Requires Explore Scientific H...

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CA$28.00
CA$28.00 - CA$28.00
CA$28.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
Save 21% Save %
Explore Scientific HR Variable Coma Corrector (2-inch) Save 30% Save %
CA$350.00
CA$350.00 - CA$350.00
CA$350.00
CA$245.00
CA$245.00 - CA$245.00
CA$245.00

Explore Scientific HR Variable Coma Corrector (2-inch)

Corrects for off-axis coma in Newtonian reflectors Designed for 2-inch focusers Variable spacer with markings for fine-tuning EMC (Enhanced Multil...

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CA$350.00
CA$350.00 - CA$350.00
CA$350.00
CA$245.00
CA$245.00 - CA$245.00
CA$245.00
Save 30% Save %
Save 20% Save %
CA$97.99
CA$97.99 - CA$97.99
CA$97.99
CA$78.00
CA$78.00 - CA$78.00
CA$78.00

Explore Scientific iEXOS-100 Azimuth Adjuster Adapter

Enables fine azimuth adjustments for the iEXOS-100 mount Essential for achieving precise polar alignment Improves tracking accuracy for long-expos...

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CA$97.99
CA$97.99 - CA$97.99
CA$97.99
CA$78.00
CA$78.00 - CA$78.00
CA$78.00
Save 20% Save %
Save 30% Save %
CA$111.99
CA$111.99 - CA$111.99
CA$111.99
CA$78.00
CA$78.00 - CA$78.00
CA$78.00

Explore Scientific Illuminated Polar Finder

Enables Precise Polar Alignment for Astrophotography Features an Illuminated Reticle with Polar Assist Markings Essential Upgrade for Eliminating ...

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CA$111.99
CA$111.99 - CA$111.99
CA$111.99
CA$78.00
CA$78.00 - CA$78.00
CA$78.00
Save 30% Save %
Save 20% Save %
CA$83.99
CA$83.99 - CA$83.99
CA$83.99
CA$67.00
CA$67.00 - CA$67.00
CA$67.00

Explore Scientific Illuminator II for Finder Scopes

Replaces standard finder illuminators Powered by two common AAA batteries (not included) Variable brightness control from dim to bright Weight: 1....

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CA$83.99
CA$83.99 - CA$83.99
CA$83.99
CA$67.00
CA$67.00 - CA$67.00
CA$67.00
Save 20% Save %
Save 17% Save %
CA$29.00
CA$29.00 - CA$29.00
CA$29.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00

Explore Scientific M42x0.75 Adapter for FFEDAPO

Connects cameras to the Explore Scientific FFEDAPO Field Flattener Provides standard male M42x0.75 T-threads Accepts standard DSLR/mirrorless T-Ri...

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CA$29.00
CA$29.00 - CA$29.00
CA$29.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00
Save 17% Save %
Save 17% Save %
CA$29.00
CA$29.00 - CA$29.00
CA$29.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00

Explore Scientific M48x1 Adapter for FFEDAPO

Connects M48x1 accessories to the FFEDAPO Field Flattener Provides a larger aperture than standard M42 T-threads Designed for Explore Scientific's...

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CA$29.00
CA$29.00 - CA$29.00
CA$29.00
CA$24.00
CA$24.00 - CA$24.00
CA$24.00
Save 17% Save %
Save 20% Save %
CA$83.99
CA$83.99 - CA$83.99
CA$83.99
CA$67.00
CA$67.00 - CA$67.00
CA$67.00

Explore Scientific Medium-Vixen Style Saddle Plate

Vixen-Style Mounting Profile Solid Extruded Aluminum Construction Black Anodized Finish for Durability Medium Length for Versatile Balancing Light...

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CA$83.99
CA$83.99 - CA$83.99
CA$83.99
CA$67.00
CA$67.00 - CA$67.00
CA$67.00
Save 20% Save %
Explore Scientific Moon Crater Map (2-Sided)
Save 13% Save %
CA$15.00
CA$15.00 - CA$15.00
CA$15.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00

Explore Scientific Moon Crater Map (2-Sided)

2-Sided Lunar Reference Map Side 1: Pinpoints Key Observable Features Side 2: Marks Historic Spacecraft Landing Sites Designed as a Companion for ...

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CA$15.00
CA$15.00 - CA$15.00
CA$15.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00
Save 13% Save %
Save up to 20% Save %
CA$153.99 - CA$168.00
CA$153.99
CA$123.00 - CA$168.00
CA$123.00 - CA$168.00
CA$123.00

Explore Scientific Nebula Filter CLS - 1.25" & 2"

City Light Suppression (CLS) Filter Enhances Contrast for Deep-Sky Objects Available in 1.25" and 2" Sizes Ideal for Viewing Nebulae and Galaxies ...

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CA$153.99 - CA$168.00
CA$153.99
CA$123.00 - CA$168.00
CA$123.00 - CA$168.00
CA$123.00
Save up to 20% Save %
Explore Scientific Nebula Filter H-Alpha 1.25-inch 12nm
Save 20% Save %
CA$224.00
CA$224.00 - CA$224.00
CA$224.00
CA$179.00
CA$179.00 - CA$179.00
CA$179.00

Explore Scientific Nebula Filter H-Alpha 1.25-inch 12nm

Targets Hydrogen-Alpha emission nebulae 12nm bandpass for astrophotography 1.25-inch standard filter size Drastically improves contrast under ligh...

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CA$224.00
CA$224.00 - CA$224.00
CA$224.00
CA$179.00
CA$179.00 - CA$179.00
CA$179.00
Save 20% Save %
Explore Scientific Nebula Filter H-Alpha 2-inch 12nm
Save 20% Save %
CA$350.00
CA$350.00 - CA$350.00
CA$350.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00

Explore Scientific Nebula Filter H-Alpha 2-inch 12nm

Isolates the Hydrogen-alpha emission line at a 12nm bandpass Standard 2-inch filter format for modern focusers and filter wheels Dramatically incr...

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CA$350.00
CA$350.00 - CA$350.00
CA$350.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00
Save 20% Save %
Explore Scientific Nebula Filter H-Alpha 2-inch 7nm
Save 30% Save %
CA$420.00
CA$420.00 - CA$420.00
CA$420.00
CA$294.00
CA$294.00 - CA$294.00
CA$294.00

Explore Scientific Nebula Filter H-Alpha 2-inch 7nm

7nm H-Alpha Bandpass 2-inch Filter Format Isolates Hydrogen Emission Nebulae Blocks Urban Light Pollution Includes Individual Test Report Descr...

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CA$420.00
CA$420.00 - CA$420.00
CA$420.00
CA$294.00
CA$294.00 - CA$294.00
CA$294.00
Save 30% Save %
Explore Scientific Nebula Filter S-II 1.25-inch 12nm
Save 20% Save %
CA$224.00
CA$224.00 - CA$224.00
CA$224.00
CA$179.00
CA$179.00 - CA$179.00
CA$179.00

Explore Scientific Nebula Filter S-II 1.25-inch 12nm

Isolates the ionized sulfur (S-II) emission line at 672nm Features a 12nm bandpass to increase contrast Standard 1.25-inch filter format Ideal for...

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CA$224.00
CA$224.00 - CA$224.00
CA$224.00
CA$179.00
CA$179.00 - CA$179.00
CA$179.00
Save 20% Save %
Explore Scientific Nebula Filter S-II 1.25-inch 6.5nm
Save 20% Save %
CA$280.00
CA$280.00 - CA$280.00
CA$280.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00

Explore Scientific Nebula Filter S-II 1.25-inch 6.5nm

Isolates the ionized sulfur (S-II) emission line at 672nm Ultra-narrow 6.5nm bandpass for maximum contrast Standard 1.25-inch barrel size fits mos...

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CA$280.00
CA$280.00 - CA$280.00
CA$280.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00
Save 20% Save %
Explore Scientific Nebula Filter S-II 2-inch 12nm
Save 20% Save %
CA$350.00
CA$350.00 - CA$350.00
CA$350.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00

Explore Scientific Nebula Filter S-II 2-inch 12nm

Isolates the 672nm Sulfur-II (S-II) emission line 12nm bandpass for high-contrast views 2-inch filter size with standard threads Blocks light poll...

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CA$350.00
CA$350.00 - CA$350.00
CA$350.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00
Save 20% Save %
Explore Scientific Nebula Filter S-II 2-inch 6.5nm
Save 20% Save %
CA$420.00
CA$420.00 - CA$420.00
CA$420.00
CA$336.00
CA$336.00 - CA$336.00
CA$336.00

Explore Scientific Nebula Filter S-II 2-inch 6.5nm

6.5nm Narrow Bandpass Targets the 672nm Ionized Sulfur (S-II) Emission Line 2-inch Barrel Diameter for Larger Focusers Drastically Increases Contr...

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CA$420.00
CA$420.00 - CA$420.00
CA$420.00
CA$336.00
CA$336.00 - CA$336.00
CA$336.00
Save 20% Save %
Save 20% Save %
CA$69.99
CA$69.99 - CA$69.99
CA$69.99
CA$56.00
CA$56.00 - CA$56.00
CA$56.00

Explore Scientific Neutral Density Filter ND 0.9 - 1.25"

ND 0.9 Optical Density 1.25" Barrel Diameter Reduces Glare for Lunar Observing Aids in Splitting Unequal Double Stars Uniform Light Transmission A...

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CA$69.99
CA$69.99 - CA$69.99
CA$69.99
CA$56.00
CA$56.00 - CA$56.00
CA$56.00
Save 20% Save %
Save 20% Save %
CA$55.99
CA$55.99 - CA$55.99
CA$55.99
CA$45.00
CA$45.00 - CA$45.00
CA$45.00

Explore Scientific Rack and Pinion Focuser 2" Extension Tube

Adds Critical Outward Focuser Travel Designed for Explore Scientific ED APO Telescopes Compatible with 2-inch Rack and Pinion Focusers Descript...

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CA$55.99
CA$55.99 - CA$55.99
CA$55.99
CA$45.00
CA$45.00 - CA$45.00
CA$45.00
Save 20% Save %
Save 21% Save %
CA$62.99
CA$62.99 - CA$62.99
CA$62.99
CA$50.00
CA$50.00 - CA$50.00
CA$50.00

Explore Scientific Rack and Pinion Focuser 2.5" Extension Tube

Adds 1.5 inches of extension Designed for Explore Scientific 2.5-inch Hexagonal Focusers Maintains rigidity of the optical train Enables focus wit...

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CA$62.99
CA$62.99 - CA$62.99
CA$62.99
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
Save 21% Save %
Save 19% Save %
CA$41.99
CA$41.99 - CA$41.99
CA$41.99
CA$34.00
CA$34.00 - CA$34.00
CA$34.00

Explore Scientific Rack and Pinion Focuser Half-Inch Extension Tube

Adds half an inch (12.7 mm) of focuser back travel Designed for Explore Scientific 2-inch Rack & Pinion Focusers Compatible with Explore Scien...

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CA$41.99
CA$41.99 - CA$41.99
CA$41.99
CA$34.00
CA$34.00 - CA$34.00
CA$34.00
Save 19% Save %
Explore Scientific ReflexSight
Save 20% Save %
CA$84.00
CA$84.00 - CA$84.00
CA$84.00
CA$67.00
CA$67.00 - CA$67.00
CA$67.00

Explore Scientific ReflexSight

Zero-power reflex sight for intuitive aiming Multi-dot reticle with 4.0°, 2.0°, and 0.5° circles Fits standard mini-Vixen style dovetail bases Int...

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CA$84.00
CA$84.00 - CA$84.00
CA$84.00
CA$67.00
CA$67.00 - CA$67.00
CA$67.00
Save 20% 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.