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Closed October 10–12 for Thanksgiving weekend
Closed October 10–12 for Thanksgiving weekend

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.

Filters

CA$44.00 - CA$44.00
CA$44.00
CA$44.00 - CA$44.00
CA$44.00

Celestron Omni 9 mm - 1.25"

CEL-93318
2 in stock

9mm Focal Length for High-Magnification Views 4-Element Plössl Optical Design 50° Apparent Field of View 1.25" Barrel with Filter Threads 6mm Eye ...

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CA$44.00 - CA$44.00
CA$44.00
CA$44.00 - CA$44.00
CA$44.00
CA$74.00 - CA$74.00
CA$74.00
CA$74.00 - CA$74.00
CA$74.00

Celestron PowerSeeker Accessory Kit

CEL-94306

Two 1.25" Kellner Eyepieces (15mm & 9mm) Three 1.25" Filters (#80A Blue, #25 Red, Moon) Enhances detail on Jupiter, Saturn, and Mars Includes ...

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CA$74.00 - CA$74.00
CA$74.00
CA$74.00 - CA$74.00
CA$74.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron Ultima Edge 60° 10mm - 1.25"

CEL-93450

10mm Focal Length for High-Power Views 60° Apparent Field of View Flat-Field Optical Design for Edge-to-Edge Sharpness 16mm Eye Relief for Comfort...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$222.00 - CA$222.00
CA$222.00
CA$222.00 - CA$222.00
CA$222.00

Celestron Ultima Edge 65° 15mm - 1.25"

CEL-93451
1 in stock

65° Apparent Field of View 15mm Focal Length for higher-power magnification Flat-field design for sharp stars edge-to-edge 16mm eye relief for com...

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CA$222.00 - CA$222.00
CA$222.00
CA$222.00 - CA$222.00
CA$222.00
CA$236.00 - CA$236.00
CA$236.00
CA$236.00 - CA$236.00
CA$236.00

Celestron Ultima Edge 65° 18mm - 1.25"

CEL-93452

18mm Focal Length 65° Apparent Field of View Flat-Field 8-Element Optical Design 20mm Long Eye Relief Parfocal with other Ultima Edge Eyepieces Ac...

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CA$236.00 - CA$236.00
CA$236.00
CA$236.00 - CA$236.00
CA$236.00
CA$361.00 - CA$361.00
CA$361.00
CA$361.00 - CA$361.00
CA$361.00

Celestron Ultima Edge 65° 24mm - 1.25"

CEL-93453

24mm Focal Length in a 1.25" Barrel 65° Apparent Field of View Flat-Field 8-Element Optical Design 29mm of Eye Relief for Eyeglass Wearers Threade...

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CA$361.00 - CA$361.00
CA$361.00
CA$361.00 - CA$361.00
CA$361.00
CA$417.00 - CA$417.00
CA$417.00
CA$417.00 - CA$417.00
CA$417.00

Celestron Ultima Edge 70° 30mm - 2"

CEL-93454

30mm focal length provides low-power, wide true-field views 70° apparent field of view frames large celestial objects Flat-field optical design en...

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CA$417.00 - CA$417.00
CA$417.00
CA$417.00 - CA$417.00
CA$417.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron X-Cel LX 12 mm - 1.25"

CEL-93424
4 in stock

12mm Focal Length for Medium-High Magnification 60° Apparent Field of View Comfortable 16mm Eye Relief 6-Element Fully Multi-Coated Optics Parfoca...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron X-Cel LX 18 mm - 1.25"

CEL-93425
2 in stock

18mm Focal Length 60° Apparent Field of View 6-Element Fully Multi-Coated Optics 16mm Eye Relief Parfocal with all X-Cel LX Eyepieces 1.25" Barrel...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron X-Cel LX 2.3 mm - 1.25"

CEL-93420
1 in stock

2.3mm focal length for maximum planetary magnification 60° apparent field of view frames celestial targets 6-element fully multi-coated optical de...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron X-Cel LX 25 mm - 1.25"

CEL-93426

60° Apparent Field of View 6-Element Fully Multi-Coated Optics 16mm of Comfortable Eye Relief Parfocal with all X-Cel LX Eyepieces 1.25" Barrel wi...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron X-Cel LX 5 mm - 1.25"

CEL-93421
2 in stock

5mm Focal Length for High-Magnification Views 60° Apparent Field of View 6-Element Fully Multi-Coated Optics Extended 28mm Eye Relief Parfocal wit...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron X-Cel LX 7 mm - 1.25"

CEL-93422
4 in stock

7mm Focal Length for High-Power Planetary and Double Star Observing 60° Apparent Field of View Frames Targets Comfortably 6-Element Fully Multi-Co...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

Celestron X-Cel LX 9 mm - 1.25"

CEL-93423
2 in stock

9mm Focal Length for High-Power Planetary and Double Star Views 60° Apparent Field of View Frames Objects Comfortably 6-Element Fully Multi-Coated...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

Daystar 62° 25mm Ortho Eyepiece - 1.25"

DAY-EP25WA
1 in stock

25mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter Orthoscopic Optical Design Internally Baffled for High Contrast Description ...

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CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$489.99 - CA$489.99
CA$489.99
CA$489.99 - CA$489.99
CA$489.99

Explore Scientific 100° 14mm Waterproof Eyepiece - 2"

ES-EPWP10014-01
7 in stock

14mm Focal Length 100° Apparent Field of View 2" Barrel Diameter Argon-Purged and Waterproof Construction Fully Multi-Coated and Edge-Blackened Op...

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CA$489.99 - CA$489.99
CA$489.99
CA$489.99 - CA$489.99
CA$489.99
CA$699.99 - CA$699.99
CA$699.99
CA$699.99 - CA$699.99
CA$699.99

Explore Scientific 100° 20mm Waterproof Eyepiece - 2"

ES-EPWP10020-01
1 in stock

Expansive Apparent Field of View 2-inch Diameter Barrel Waterproof and Fog-Proof Construction Argon-Purged and Sealed Optical Housing Fully Multi-...

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CA$699.99 - CA$699.99
CA$699.99
CA$699.99 - CA$699.99
CA$699.99
CA$1,259.99 - CA$1,259.99
CA$1,259.99
CA$1,259.99 - CA$1,259.99
CA$1,259.99

Explore Scientific 100° 25mm Waterproof Eyepiece - 2"

ES-EPWP10025-01
1 in stock

100° Apparent Field of View 25mm Focal Length 2" Barrel Diameter Waterproof and Argon-Purged Construction Fully Multi-Coated and Edge-Blackened Op...

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CA$1,259.99 - CA$1,259.99
CA$1,259.99
CA$1,259.99 - CA$1,259.99
CA$1,259.99
CA$1,763.99 - CA$1,763.99
CA$1,763.99
CA$1,763.99 - CA$1,763.99
CA$1,763.99

Explore Scientific 100° 30mm Waterproof Eyepiece - 3"

ES-EPWP10030-01

30mm Focal Length 100° Apparent Field of View 3" Diameter Barrel Argon-Purged Waterproof Construction Fully Multi-Coated and Edge-Blackened Optics...

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CA$1,763.99 - CA$1,763.99
CA$1,763.99
CA$1,763.99 - CA$1,763.99
CA$1,763.99
CA$419.99 - CA$419.99
CA$419.99
CA$419.99 - CA$419.99
CA$419.99

Explore Scientific 100° 5.5mm Waterproof Eyepiece - 2"

ES-EPWP10055-01
1 in stock

5.5mm Focal Length for High-Magnification Views 100° Apparent Field of View for an Immersive Spacewalk Experience 2" Barrel Format Argon-Purged an...

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CA$419.99 - CA$419.99
CA$419.99
CA$419.99 - CA$419.99
CA$419.99
CA$419.99 - CA$419.99
CA$419.99
CA$419.99 - CA$419.99
CA$419.99

Explore Scientific 100° 9mm Waterproof Eyepiece - 2"

ES-EPWP1009-01

9mm Focal Length 100° Apparent Field of View 2" Barrel Diameter Argon-Purged Waterproof Construction Fully Multi-Coated Optics Description FAQ ...

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CA$419.99 - CA$419.99
CA$419.99
CA$419.99 - CA$419.99
CA$419.99
CA$1,259.99 - CA$1,259.99
CA$1,259.99
CA$1,259.99 - CA$1,259.99
CA$1,259.99

Explore Scientific 120° 9mm Waterproof Eyepiece -2"

ES-EPWP12009-01

9mm Focal Length 120° Apparent Field of View 2-Inch Diameter Barrel Argon-Purged Waterproof Construction Ideal for Non-Driven Telescopes Descri...

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CA$1,259.99 - CA$1,259.99
CA$1,259.99
CA$1,259.99 - CA$1,259.99
CA$1,259.99
CA$97.99 - CA$97.99
CA$97.99
CA$97.99 - CA$97.99
CA$97.99

Explore Scientific 52° 10mm Waterproof Eyepiece - 1.25"

ES-EPWP5210-01
2 in stock

10mm Focal Length 52° Apparent Field of View 1.25" Barrel Diameter Waterproof, Argon-Purged Construction Flat-Field Multi-Element Optical Design ...

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CA$97.99 - CA$97.99
CA$97.99
CA$97.99 - CA$97.99
CA$97.99
CA$97.99 - CA$97.99
CA$97.99
CA$97.99 - CA$97.99
CA$97.99

Explore Scientific 52° 15mm Waterproof Eyepiece - 1.25"

ES-EPWP5215-01
12 in stock

15mm Focal Length 52° Apparent Field of View 1.25" Barrel Diameter Waterproof, Argon-Purged Construction Flat-Field Multi-Element Optical Design ...

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CA$97.99 - CA$97.99
CA$97.99
CA$97.99 - CA$97.99
CA$97.99

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.