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Eyepieces

Eyepieces are the only part of a telescope you actually look through, and they are where a modest instrument can be made to feel expensive or an expensive one made to feel disappointing. David Astro stocks eyepieces in Canada across 1.25", 2" and 3" barrels, from wide-field 82 and 100 degree designs to compact planetary orthoscopics, shipped domestically.

We help customers build sets rather than accumulate overlapping focal lengths. Tell us your telescope's aperture and focal length and typical seeing at your site, and we will suggest three or four eyepieces that cover the useful magnification range without redundancy.

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

Explore Scientific 72° ED Series 20mm Waterproof Eyepiece

ES-EPWP7220ED-01

20mm Focal Length 72° Apparent Field of View 1.25" Barrel Diameter Waterproof & Gas-Purged Construction Extra-Low Dispersion (ED) Glass Des...

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

Explore Scientific 72° ED Series 25mm Waterproof Eyepiece

ES-EPWP7225ED-01

25mm Focal Length 72° Apparent Field of View 2-Inch Barrel Diameter Extra-Low Dispersion (ED) Glass Waterproof and Gas-Purged Construction Desc...

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

Explore Scientific 72° ED Series 30mm Waterproof Eyepiece

ES-EPWP7230ED-01

30mm Focal Length 72° Apparent Field of View 2-inch Barrel Diameter Extra-Low Dispersion (ED) Glass Waterproof and Gas-Purged Construction Desc...

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

Explore Scientific 72° ED Series 6.5mm Waterproof Eyepiece

ES-EPWP7265ED-01

6.5mm Focal Length for High Magnification 72° Apparent Field of View 1.25" Barrel Diameter Extra-Low Dispersion (ED) Glass Element Waterproof and ...

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

Explore Scientific 82° 11mm Waterproof Eyepiece - 1.25"

ES-EPWP8211-01

11mm Focal Length 82° Apparent Field of View 1.25" Barrel Diameter Waterproof & Argon-Purged Construction Enhanced Multilayer Deposition (EMD)...

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$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99

Explore Scientific 82° 14mm Waterproof Eyepiece - 1.25"

ES-EPWP8214-01

14mm Focal Length 82° Apparent Field of View 1.25" Barrel Diameter Waterproof & Argon-Purged Design EMD (Enhanced Multilayer Deposition) Coati...

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

Explore Scientific 82° 18mm Waterproof Eyepiece - 2"

ES-EPWP8218-01

18mm Focal Length 82° Apparent Field of View 2" Diameter Barrel Waterproof and Argon-Purged Construction Enhanced Multilayer Deposition (EMD) Coat...

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

Explore Scientific 82° 24mm Waterproof Eyepiece - 2"

ES-EPWP8224-01
1 in stock

24mm Focal Length 82° Apparent Field of View 2" Barrel Diameter Argon-Purged Waterproof Design Enhanced Multilayer Deposition (EMD) Coatings De...

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

Explore Scientific 82° 30mm Waterproof Eyepiece - 2"

ES-EPWP8230-01
5 in stock

30mm Focal Length 82° Apparent Field of View 2" Barrel Diameter Waterproof and Argon-Purged Construction Enhanced Multilayer Deposition (EMD) Coat...

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

Explore Scientific 82° 4.5mm LER Waterproof Eyepiece - 1.25"

ES-EPWP8245LE-01
2 in stock

82° Apparent Field of View 4.5mm High-Magnification Focal Length 15.9mm Long Eye Relief (LER) Argon-Purged Waterproof Construction 1.25" Barrel Di...

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$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99

Explore Scientific 82° 6.5mm LER Waterproof Eyepiece - 1.25"

ES-EPWP8265LE-01

6.5mm Focal Length 82° Apparent Field of View 16.8mm Long Eye Relief (LER) 1.25" Barrel Diameter Argon-Purged Waterproof Construction Descripti...

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$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99

Explore Scientific 82° 8.5mm LER Waterproof Eyepiece - 1.25"

ES-EPWP8285LE-01

8.5mm Focal Length for High Magnification 82° Apparent Field of View 15mm Long Eye Relief (LER) 1.25" Barrel Diameter Argon-Purged Waterproof Cons...

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$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
$309.99 - $309.99
$309.99
$309.99 - $309.99
$309.99

Explore Scientific 92° 12mm Long Eye Relief Waterproof Eyepiece - 2"

ES-EPWP9212-01

12mm Focal Length 92° Apparent Field of View 2" Barrel Diameter Long Eye Relief for Viewing Comfort Argon-Purged Waterproof Construction Descri...

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$309.99 - $309.99
$309.99
$309.99 - $309.99
$309.99
$369.99 - $369.99
$369.99
$369.99 - $369.99
$369.99

Explore Scientific 92° 17mm Long Eye Relief Waterproof Eyepiece - 2"

ES-EPWP9217-01

17mm Focal Length 92° Apparent Field of View 2" Barrel Diameter Long Eye Relief Design Argon-Purged Waterproof Construction Description FAQ Spe...

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$369.99 - $369.99
$369.99
$369.99 - $369.99
$369.99
Explore Scientific 92° ED Series 14mm Waterproof Eyepiece
$449.99 - $449.99
$449.99
$449.99 - $449.99
$449.99

Explore Scientific 92° ED Series 14mm Waterproof Eyepiece

ES-EPWP9214ED-01

14mm Focal Length 92° Apparent Field of View 2-inch Barrel Diameter Extra-Low Dispersion (ED) Glass Element Waterproof, Gas-Purged Construction ...

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$449.99 - $449.99
$449.99
$449.99 - $449.99
$449.99
Explore Scientific 92° ED Series 20mm Waterproof Eyepiece
$449.99 - $449.99
$449.99
$449.99 - $449.99
$449.99

Explore Scientific 92° ED Series 20mm Waterproof Eyepiece

ES-EPWP9220ED-01

92° Apparent Field of View 20mm Focal Length 2-Inch Barrel Diameter Extra-Low Dispersion (ED) Glass Element Waterproof and Gas-Purged Construction...

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$449.99 - $449.99
$449.99
$449.99 - $449.99
$449.99
Explore Scientific 92° ED Series 25mm Waterproof Eyepiece
$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99

Explore Scientific 92° ED Series 25mm Waterproof Eyepiece

ES-EPWP9225ED-01

92° Apparent Field of View 25mm Focal Length 2" Barrel Diameter Extra-Low Dispersion (ED) Glass Waterproof and Fog-Proof Construction Descripti...

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$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99
Explore Scientific 92° ED Series 9mm Waterproof Eyepiece
$449.99 - $449.99
$449.99
$449.99 - $449.99
$449.99

Explore Scientific 92° ED Series 9mm Waterproof Eyepiece

ES-EPWP9209ED-01

9mm Focal Length 92° Apparent Field of View 2-inch Barrel Diameter Extra-Low Dispersion (ED) Glass Waterproof and Gas-Purged Construction Descr...

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$449.99 - $449.99
$449.99
$449.99 - $449.99
$449.99
iOptron Plossl 52° 25mm Eyepiece (1.25'')
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

iOptron Plossl 52° 25mm Eyepiece (1.25'')

IOP-6241-25

25mm Focal Length 52° Apparent Field of View 1.25" Barrel Diameter Classic Plössl Optical Design Description FAQ Specifications In the Box Warr...

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$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
iOptron Super View 68° 30mm Eyepiece (2")
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00

iOptron Super View 68° 30mm Eyepiece (2")

IOP-6242-30

30mm Focal Length 68° Apparent Field of View 2-inch Barrel Diameter Low-Power, Wide-Field Design Ideal for Locating and Framing Large Objects D...

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$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

Lunt 53° 27mm Flat-Field Eyepiece - 1.25"

LSS-LS27E
2 in stock

27mm Focal Length 53° Apparent Field of View 1.25" Barrel Size Flat-Field Optical Design Description FAQ Specifications In the Box Downloads Wa...

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$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

Lunt 60° 12mm Flat-Field Eyepiece - 1.25"

LSS-LS12E
2 in stock

12mm Focal Length 60° Apparent Field of View Flat-Field Optical Design Etalon-Grade Anti-Reflective Coatings 1.25" Barrel Diameter Description ...

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$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

Lunt 60° 16mm Flat-Field Eyepiece - 1.25"

LSS-LS16E
1 in stock

16mm Focal Length 60° Apparent Field of View 1.25" Barrel Diameter Flat-Field Optical Design Solar-Optimized 0.1% Anti-Reflective Coatings Desc...

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$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

Lunt 60° 8mm Flat-Field Eyepiece - 1.25"

LSS-LS8E
1 in stock

8mm Focal Length 60° Apparent Field of View Flat-Field Optical Design Optimized for H-Alpha Solar Viewing 1.25" Barrel Diameter Description FAQ...

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$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

How to Choose Eyepiece Focal Lengths

Magnification is your telescope's focal length divided by the eyepiece's. Exit pupil — eyepiece focal length divided by focal ratio — determines how bright and comfortable the view is, and it is the number that actually sets the useful range.

  • Low power, 5 to 7 mm exit pupil: Widest true field for large nebulae, star fields and finding targets. Above 7 mm your eye's pupil clips the beam and you waste aperture.
  • Medium power, 2 to 3 mm exit pupil: The workhorse range for most deep-sky observing, balancing image scale against background darkness.
  • High power, 0.7 to 1 mm exit pupil: Planetary, lunar and double star work. Canadian seeing usually caps useful magnification well below the theoretical limit.
  • Apparent field of view: 50 degree designs are compact and inexpensive; 82 and 100 degree designs give an immersive view and much longer tracking time in an undriven Dobsonian.
  • Eye relief: Eyeglass wearers need roughly 15 mm or more. Short focal length simple designs often have very little, which makes them uncomfortable regardless of optical quality.
  • Barrel size: 2" barrels are needed for long focal length wide-field eyepieces; 1.25" covers everything from medium to high power.

Why Choose David Astro for Eyepieces

An eyepiece recommendation is only useful if it accounts for the telescope it will be used in and the sky it will be used under.

  • Set planning, not single sales: We space focal lengths so each step is a meaningful jump, typically by a factor of roughly 1.4 to 1.5, instead of selling you two eyepieces that give nearly the same view.
  • Focal ratio honesty: Below f/5, simple designs show edge aberrations that no coating fixes. We say so, and we also say when a premium eyepiece will not visibly improve a slow telescope.
  • Exit pupil calculated for you: We work out the useful range for your specific aperture and focal length rather than quoting general rules.
  • Authorized dealer: Genuine eyepieces with manufacturer warranty, in stock here and shipped without customs delays for Canadian buyers.
  • Domestic shipping: Ships from Canada with no duties or brokerage fees for Canadian orders.

Eyepieces in Canada — Frequently Asked Questions

How many eyepieces do I actually need?
Three or four covers almost everything: a low power for finding and wide fields, one or two medium powers for deep sky, and one high power for planets. A good Barlow can substitute for one of them.
Are 100 degree eyepieces worth the price?
In an undriven Dobsonian, very much so — objects stay in the field far longer and the view is immersive. On a tracking mount at medium power the advantage is real but smaller, and the weight can upset balance.
What is the highest magnification I can use?
Optically, roughly twice the aperture in millimetres. Practically, Canadian seeing limits most nights to 150 to 250x regardless of aperture, and pushing past that gives a larger, softer image rather than more detail.
Do I need 2 inch eyepieces?
Only for long focal length wide-field views. If your telescope's maximum true field is already limited by a 1.25 inch barrel and you want more, a 2 inch focuser and eyepiece is the way to get it.

Building an eyepiece set?

Tell us your telescope and observing site and we will map out a complete set. Authorized dealer, Canadian stock.