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Explore Scientific

Explore Scientific occupies a useful place in the market: optics and eyepieces built to a standard that used to cost considerably more, backed by a transferable warranty. Their waterproof, argon-purged wide-field eyepieces and FCD-100 air-spaced apochromatic refractors are the products most often recommended to observers who have outgrown entry-level gear. David Astro carries Explore Scientific products in Canada, held in stock for fast domestic shipping.

Our team uses these instruments in the field, including in the cold and damp conditions where the argon purging in the eyepiece line genuinely earns its keep. We can tell you where the line's strengths are and where a different brand suits your use better.

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$109.99 USD - $109.99 USD
$109.99 USD
$109.99 USD - $109.99 USD
$109.99 USD

Explore Scientific Oculaire étanche 68° 24mm - 1.25"

Focale de 24mm Champ apparent de 68° Coulant de 1.25" de diamètre Construction étanche purgée à l'argon Parfocal avec les oculaires de la série 68...

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$109.99 USD - $109.99 USD
$109.99 USD
$109.99 USD - $109.99 USD
$109.99 USD
$169.99 USD - $169.99 USD
$169.99 USD
$169.99 USD - $169.99 USD
$169.99 USD

Explore Scientific Oculaire étanche 68° 28mm - 2"

Focale de 28mm Champ apparent de 68° Coulant de 2" de diamètre Construction étanche purgée à l'argon Long dégagement oculaire avec bonnette replia...

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$169.99 USD - $169.99 USD
$169.99 USD
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$169.99 USD
$219.99 USD - $219.99 USD
$219.99 USD
$219.99 USD - $219.99 USD
$219.99 USD

Explore Scientific Oculaire étanche 68° 34mm - 2"

Focale de 34mm Champ apparent de 68° Coulant de 2" de diamètre Construction étanche purgée à l'argon Parfocal avec les autres oculaires de la séri...

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$219.99 USD - $219.99 USD
$219.99 USD
$219.99 USD - $219.99 USD
$219.99 USD
$309.99 USD - $309.99 USD
$309.99 USD
$309.99 USD - $309.99 USD
$309.99 USD

Explore Scientific Oculaire étanche 68° 40mm - 2"

Focale de 40mm Champ apparent de 68° Coulant de 2" de diamètre Construction étanche purgée à l'argon Long dégagement oculaire pour les porteurs de...

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$309.99 USD - $309.99 USD
$309.99 USD
$309.99 USD - $309.99 USD
$309.99 USD
Explore Scientific 72° ED 40mm Waterproof Eyepiece
$449.99 USD - $449.99 USD
$449.99 USD
$449.99 USD - $449.99 USD
$449.99 USD

Explore Scientific Oculaire étanche ED 72° 40mm

Focale de 40mm Champ apparent de 72° Coulant de 2" de diamètre Verre à dispersion extra-faible (ED) Construction étanche purgée au gaz Descript...

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$449.99 USD - $449.99 USD
$449.99 USD
$449.99 USD - $449.99 USD
$449.99 USD
Explore Scientific 72° ED 8.5mm Waterproof Eyepiece
$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD

Explore Scientific Oculaire étanche ED 72° 8.5mm

Focale de 8.5mm Champ apparent de 72° Verre à dispersion extra-faible (ED) Coulant de 1.25" de diamètre Étanche et purgé au gaz Description FAQ...

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$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD
Explore Scientific 72° ED Series 11.5mm Waterproof Eyepiece
$299.99 USD - $299.99 USD
$299.99 USD
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$299.99 USD

Explore Scientific Oculaire étanche série ED 72° 11.5mm

Focale de 11.5mm Champ apparent de 72° Verre à dispersion extra-faible (ED) Coulant de 1.25" de diamètre Construction étanche Description FAQ C...

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$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD
Explore Scientific 72° ED Series 15mm Waterproof Eyepiece
$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD

Explore Scientific Oculaire étanche série ED 72° 15mm

Focale de 15mm Champ apparent de 72° Coulant de 1.25" de diamètre Verre à dispersion extra-faible (ED) Construction étanche Description FAQ Car...

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$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD
Explore Scientific 72° ED Series 20mm Waterproof Eyepiece
$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD

Explore Scientific Oculaire étanche série ED 72° 20mm

Focale de 20mm Champ apparent de 72° Coulant de 1.25" de diamètre Construction étanche & purgée au gaz Verre à dispersion extra-faible (ED) ...

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$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD
Explore Scientific 72° ED Series 25mm Waterproof Eyepiece
$349.99 USD - $349.99 USD
$349.99 USD
$349.99 USD - $349.99 USD
$349.99 USD

Explore Scientific Oculaire étanche série ED 72° 25mm

Focale de 25mm Champ apparent de 72° Coulant de 2" de diamètre Verre à dispersion extra-faible (ED) Construction étanche et purgée au gaz Descr...

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$349.99 USD - $349.99 USD
$349.99 USD
$349.99 USD - $349.99 USD
$349.99 USD
Explore Scientific 72° ED Series 30mm Waterproof Eyepiece
$399.99 USD - $399.99 USD
$399.99 USD
$399.99 USD - $399.99 USD
$399.99 USD

Explore Scientific Oculaire étanche série ED 72° 30mm

Focale de 30mm Champ apparent de 72° Coulant de 2" de diamètre Verre à dispersion extra-faible (ED) Construction étanche et purgée au gaz Descr...

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$399.99 USD - $399.99 USD
$399.99 USD
$399.99 USD - $399.99 USD
$399.99 USD
Explore Scientific 72° ED Series 6.5mm Waterproof Eyepiece
$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD

Explore Scientific Oculaire étanche série ED 72° 6.5mm

Focale de 6.5mm pour un fort grossissement Champ apparent de 72° Coulant de 1.25" de diamètre Élément en verre à dispersion extra-faible (ED) Cons...

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$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD
Explore Scientific 8-inch Dobsonian Reflector Telescope (Red)
$699.99 USD - $699.99 USD
$699.99 USD
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$699.99 USD

Explore Scientific Télescope réflecteur Dobson 8" (Rouge)

Miroir primaire de 208mm (8") Focale de 1219mm Rapport focal de f/5.9 Monture de type Dobson Porte-oculaire Crayford de 2" avec adaptateur de 1.25...

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$699.99 USD - $699.99 USD
$699.99 USD
$699.99 USD - $699.99 USD
$699.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
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$149.99 USD

Explore Scientific Oculaire étanche 82° 11mm - 1.25"

Focale de 11mm Champ apparent de 82° Coulant de 1.25" de diamètre Dégagement oculaire de 21.6mm Construction étanche purgée à l'argon Traitements ...

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$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
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$149.99 USD

Explore Scientific Oculaire étanche 82° 14mm - 1.25"

Focale de 14mm Champ apparent de 82° Coulant de 1.25" de diamètre Conception étanche & purgée à l'argon Dégagement oculaire de 15.6mm 7 élémen...

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$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$189.99 USD - $189.99 USD
$189.99 USD
$189.99 USD - $189.99 USD
$189.99 USD

Explore Scientific Oculaire étanche 82° 18mm - 2"

Focale de 18mm Champ apparent de 82° Coulant de 2" de diamètre Construction étanche et purgée à l'argon 7 éléments en 4 groupes Diaphragme de cham...

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$189.99 USD - $189.99 USD
$189.99 USD
$189.99 USD - $189.99 USD
$189.99 USD
$249.99 USD - $249.99 USD
$249.99 USD
$249.99 USD - $249.99 USD
$249.99 USD

Explore Scientific Oculaire étanche 82° 24mm - 2"

Focale de 24mm Champ apparent de 82° Dégagement oculaire de 17.5mm Coulant de 2" de diamètre Conception étanche purgée à l'argon 7 éléments en 4 g...

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$249.99 USD - $249.99 USD
$249.99 USD
$249.99 USD - $249.99 USD
$249.99 USD
$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD

Explore Scientific Oculaire étanche 82° 30mm - 2"

Focale : 30mm Champ apparent : 82° Diamètre du coulant : 2" Dégagement oculaire : 21.6mm Diaphragme de champ : 43mm Poids : 1007 g Descri...

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$299.99 USD - $299.99 USD
$299.99 USD
$299.99 USD - $299.99 USD
$299.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD

Explore Scientific Oculaire étanche LER 82° 4.5mm - 1.25"

Champ apparent de 82° Focale de 4.5mm pour un fort grossissement Grand dégagement oculaire (LER) de 15.9mm Construction étanche purgée à l'argon C...

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$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD

Explore Scientific Oculaire étanche LER 82° 6.5mm - 1.25"

Focale de 6.5mm Champ apparent de 82° Grand dégagement oculaire (LER) de 16.8mm Coulant de 1.25" 7 lentilles en 5 groupes Construction étanche pur...

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$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD

Explore Scientific Oculaire étanche LER 82° 8.5mm - 1.25"

Focale de 8.5mm pour un fort grossissement Champ apparent de 82° Grand dégagement oculaire (LER) de 15mm Coulant de 1.25" Construction étanche pur...

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$149.99 USD - $149.99 USD
$149.99 USD
$149.99 USD - $149.99 USD
$149.99 USD
$199.99 USD - $199.99 USD
$199.99 USD
$199.99 USD - $199.99 USD
$199.99 USD

Explore Scientific Chercheur polaire coudé lumineux 8x50

Grossissement 8x Ouverture 50mm Oculaire à renvoi coudé Optique à image redressée Réticule polaire lumineux pour les hémisphères nord et sud Régla...

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$199.99 USD - $199.99 USD
$199.99 USD
$199.99 USD - $199.99 USD
$199.99 USD
$79.99 USD - $79.99 USD
$79.99 USD
$79.99 USD - $79.99 USD
$79.99 USD

Explore Scientific Chercheur 8x50 non lumineux

Conception optique 8x50 Vision directe Réticule à croisillon standard Champ de 6° Compatible avec les bases de chercheur Explore Scientific Des...

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$79.99 USD - $79.99 USD
$79.99 USD
$79.99 USD - $79.99 USD
$79.99 USD
$179.99 USD - $179.99 USD
$179.99 USD
$179.99 USD - $179.99 USD
$179.99 USD

Explore Scientific Chercheur lumineux à vision directe 8x50 avec support

Grossissement 8x et ouverture 50mm Large champ réel de 6° Réticule lumineux à centre ouvert avec échelles de mesure Image correctement orientée (d...

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$179.99 USD - $179.99 USD
$179.99 USD
$179.99 USD - $179.99 USD
$179.99 USD

The Explore Scientific Lineup

Explore Scientific covers visual and imaging from beginner through advanced, with the eyepiece series being the best-known part of the catalogue.

  • 62, 68, 82 and 92 degree eyepieces: Waterproof and argon-purged so internal surfaces cannot fog, which matters on humid Canadian summer nights and in rapid temperature drops.
  • 100 degree series: Very wide apparent field designs for immersive views, particularly effective in undriven Dobsonians where field width equals tracking time.
  • ED apochromatic refractors: FCD-100 and FCD-1 glass air-spaced triplets with carbon fibre and aluminium tube options, suited to both wide-field imaging and high-contrast visual use.
  • Truss-tube and solid-tube Dobsonians: Large-aperture visual instruments with collapsible designs that make transport realistic.
  • Maksutov-Newtonian and Cassegrain optics: Long focal length designs for planetary and lunar detail.
  • Diagonals, Barlows and accessories: Dielectric diagonals, focal extenders and finders designed around the rest of the line.

Why Choose David Astro for Explore Scientific

Explore Scientific's range is broad enough that the wrong choice within it is easy. We narrow it against your telescope and your sky.

  • Eyepiece series matched to focal ratio: The wider series perform best in fast telescopes where cheaper designs break down at the edge; in slow scopes the narrower series is often the better value.
  • Weight and balance checked: The 100 degree eyepieces are heavy enough to unbalance a small Dobsonian, and we will tell you before you order rather than after.
  • Authorized dealer: Full manufacturer warranty, with the transferable coverage properly registered and warranty handled domestically.
  • Canadian stock: In-stock items ship from Canada with no duties or brokerage fees for Canadian buyers.
  • Setup and collimation support: In-house help with first light on the larger Dobsonians and Newtonians.

Explore Scientific in Canada — Frequently Asked Questions

What does argon purging actually do?
It replaces the air inside the eyepiece with dry argon and seals it, so interior lens surfaces cannot fog when the eyepiece is moved between warm and cold air. In Canadian conditions that happens constantly.
Is the 82 or the 92 degree series better?
The 92 series has a wider field and better edge correction in fast telescopes, at more weight and cost. In an f/8 or slower scope the 82 series performs very close to it for considerably less.
Are the ED refractors good for imaging?
Yes, paired with a matched field flattener. The triplet designs control colour well enough for broadband imaging, and the focusers on the current models handle typical imaging trains.
Is the warranty valid if I buy in Canada?
Yes, and it is handled here. As an authorized dealer we register and service warranty claims domestically, without international shipping.

Choosing within the range?

Tell us your telescope and what you observe, and we will narrow it down. Canadian stock, warranty handled here.