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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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Tele Vue Nagler T4 22mm 82° Eyepiece - 2" 2
Tele Vue Nagler T4 22mm 82° Eyepiece - 2" 1
CA$771.00 - CA$771.00
CA$771.00
CA$771.00 - CA$771.00
CA$771.00

Tele Vue Nagler T4 22mm 82° Eyepiece - 2"

TV-EN4-22.0

Focal Length: 22mm Apparent Field of View: 82° Barrel Size: 2-inch Eye Relief: 19mm Field Stop Diameter: 31.1mm Paracorr Type 2 Optimized Descr...

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CA$771.00 - CA$771.00
CA$771.00
CA$771.00 - CA$771.00
CA$771.00
Tele Vue Nagler T5 16mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T5 16mm 82° Eyepiece - 1.25" 1
CA$585.00 - CA$585.00
CA$585.00
CA$585.00 - CA$585.00
CA$585.00

Tele Vue Nagler T5 16mm 82° Eyepiece - 1.25"

TV-EN5-16.0
1 in stock

Focal Length: 16mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 10mm Field Stop: 17.4mm Weight: 0.45 lbs (204g) Description FAQ S...

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CA$585.00 - CA$585.00
CA$585.00
CA$585.00 - CA$585.00
CA$585.00
CA$1,104.00 - CA$1,104.00
CA$1,104.00
CA$1,104.00 - CA$1,104.00
CA$1,104.00

Tele Vue Nagler T5 31mm 82° Eyepiece - 2"

TV-EN5-31.0
1 in stock

31mm Focal Length 82° Apparent Field of View 2" Diameter Barrel 19mm Eye Relief 42mm Field Stop Description FAQ Specifications In the Box Downl...

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CA$1,104.00 - CA$1,104.00
CA$1,104.00
CA$1,104.00 - CA$1,104.00
CA$1,104.00
CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00

Tele Vue Nagler T6 13mm 82° Eyepiece - 1.25"

TV-EN6-13.0

13mm Focal Length 82° Apparent Field of View 1.25" Barrel Diameter 12mm Eye Relief 17.6mm Field Stop Description FAQ Specificat...

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CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00
Tele Vue Nagler T6 3.5mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T6 3.5mm 82° Eyepiece - 1.25" 1
CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00

Tele Vue Nagler T6 3.5mm 82° Eyepiece - 1.25"

TV-EN6-03.5
1 in stock

Focal Length: 3.5mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Design: 7 Elements in 4 Groups (Nagler Type 6) Weight:...

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CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00
Tele Vue Nagler T6 5mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T6 5mm 82° Eyepiece - 1.25" 1
CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00

Tele Vue Nagler T6 5mm 82° Eyepiece - 1.25"

TV-EN6-05.0
1 in stock

Focal Length: 5mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Design: Nagler Type 6 (7 elements) Weight: 7.2 oz (0.20 ...

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CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00
Tele Vue Nagler T6 7mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T6 7mm 82° Eyepiece - 1.25" 1
CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00

Tele Vue Nagler T6 7mm 82° Eyepiece - 1.25"

TV-EN6-07.0
1 in stock

Focal Length: 7mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Elements: 7 Weight: 0.45 lbs / 204 g Description FAQ ...

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CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00
Tele Vue Nagler T6 9mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T6 9mm 82° Eyepiece - 1.25" 1
CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00

Tele Vue Nagler T6 9mm 82° Eyepiece - 1.25"

TV-EN6-09.0
1 in stock

Focal Length: 9mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Elements: 7 Weight: 0.45 lbs / 204 g Description FAQ ...

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CA$533.00 - CA$533.00
CA$533.00
CA$533.00 - CA$533.00
CA$533.00
Tele Vue Nagler T7 14mm 82° Eyepiece - 1.25" 1
CA$958.00 - CA$958.00
CA$958.00
CA$958.00 - CA$958.00
CA$958.00

Tele Vue Nagler T7 14mm 82° Eyepiece - 1.25"

TV-EN7-14.0

Focal Length: 14mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Elements: 7 Weight: 0.50 lbs / 227g Description FAQ ...

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CA$958.00 - CA$958.00
CA$958.00
CA$958.00 - CA$958.00
CA$958.00
Tele Vue Nagler T7 19mm 82° Eyepiece - 1.25" 1
CA$1,012.00 - CA$1,012.00
CA$1,012.00
CA$1,012.00 - CA$1,012.00
CA$1,012.00

Tele Vue Nagler T7 19mm 82° Eyepiece - 1.25"

TV-EN7-19.0
1 in stock

Focal Length: 19mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Elements: 7 Description FAQ Specifications In the Bo...

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CA$1,012.00 - CA$1,012.00
CA$1,012.00
CA$1,012.00 - CA$1,012.00
CA$1,012.00
Tele Vue Nagler T7 5.5mm 82° Eyepiece - 1.25" 1
CA$958.00 - CA$958.00
CA$958.00
CA$958.00 - CA$958.00
CA$958.00

Tele Vue Nagler T7 5.5mm 82° Eyepiece - 1.25"

TV-EN7-05.5

Focal Length: 5.5mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Design: Nagler (7 elements) Description FAQ Specifi...

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CA$958.00 - CA$958.00
CA$958.00
CA$958.00 - CA$958.00
CA$958.00
Tele Vue Nagler T7 9mm 82° Eyepiece - 1.25" 1
CA$958.00 - CA$958.00
CA$958.00
CA$958.00 - CA$958.00
CA$958.00

Tele Vue Nagler T7 9mm 82° Eyepiece - 1.25"

TV-EN7-09.0

Focal Length: 9mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Design: Nagler Type 7 Description FAQ Specifications ...

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CA$958.00 - CA$958.00
CA$958.00
CA$958.00 - CA$958.00
CA$958.00
Tele Vue Nagler Zoom 3-6mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler Zoom 3-6mm 82° Eyepiece - 1.25" 1
CA$682.00 - CA$682.00
CA$682.00
CA$682.00 - CA$682.00
CA$682.00

Tele Vue Nagler Zoom 3-6mm 82° Eyepiece - 1.25"

TV-ENZ-0306

Focal Length: 3mm to 6mm Zoom Apparent Field of View: 82° (Constant) Barrel Size: 1.25" Eye Relief: 10mm Field Stop Diameter: 4.8mm (at 6mm) - 2.4...

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CA$682.00 - CA$682.00
CA$682.00
CA$682.00 - CA$682.00
CA$682.00
CA$436.00 - CA$436.00
CA$436.00
CA$436.00 - CA$436.00
CA$436.00

Tele Vue Panoptic 19mm 68° Eyepiece - 1.25"

TV-EPN-19.0
1 in stock

19mm Focal Length 68° Apparent Field of View 1.25" Diameter Barrel 10mm Eye Relief 21.3mm Field Stop Description FAQ Specifications In the Box ...

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CA$436.00 - CA$436.00
CA$436.00
CA$436.00 - CA$436.00
CA$436.00
CA$558.00 - CA$558.00
CA$558.00
CA$558.00 - CA$558.00
CA$558.00

Tele Vue Panoptic 24mm 68° Eyepiece - 1.25"

TV-EPN-24.0

24mm Focal Length 68° Apparent Field of View 1.25" Diameter Barrel 15mm Eye Relief 27mm Field Stop Description FAQ Specifications In the Box Do...

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CA$558.00 - CA$558.00
CA$558.00
CA$558.00 - CA$558.00
CA$558.00
CA$604.00 - CA$604.00
CA$604.00
CA$604.00 - CA$604.00
CA$604.00

Tele Vue Panoptic 27mm 68° Eyepiece - 2"

TV-EPN-27.0

27mm Focal Length 68° Apparent Field of View 2" Diameter Barrel 19mm Eye Relief 30.5mm Field Stop Description FAQ Specifications In the Box Dow...

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CA$604.00 - CA$604.00
CA$604.00
CA$604.00 - CA$604.00
CA$604.00
CA$679.00 - CA$679.00
CA$679.00
CA$679.00 - CA$679.00
CA$679.00

Tele Vue Panoptic 35mm 68° Eyepiece - 2"

TV-EPN-35.0
1 in stock

35mm Focal Length 68° Apparent Field of View 2" Diameter Barrel 24mm Eye Relief 38.7mm Field Stop Description FAQ Specifications In the Box Dow...

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CA$679.00 - CA$679.00
CA$679.00
CA$679.00 - CA$679.00
CA$679.00
CA$915.00 - CA$915.00
CA$915.00
CA$915.00 - CA$915.00
CA$915.00

Tele Vue Panoptic 41mm 68° Eyepiece - 2"

TV-EPN-41.0

41mm Focal Length 68° Apparent Field of View 2" Diameter Barrel 27mm Eye Relief 46mm Field Stop Description FAQ Specifications In the Box Downl...

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CA$915.00 - CA$915.00
CA$915.00
CA$915.00 - CA$915.00
CA$915.00
CA$1,043.00 - CA$1,043.00
CA$1,043.00
CA$1,043.00 - CA$1,043.00
CA$1,043.00

TeleVue Ethos 10mm 100° Eyepiece - 1.25"/2"

TV-ETH-10.0

10mm Focal Length 100° Apparent Field of View 2" / 1.25" Hybrid Barrel 15mm Eye Relief 17.7mm Field Stop Description FAQ Specifications In the ...

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CA$1,043.00 - CA$1,043.00
CA$1,043.00
CA$1,043.00 - CA$1,043.00
CA$1,043.00
CA$1,043.00 - CA$1,043.00
CA$1,043.00
CA$1,043.00 - CA$1,043.00
CA$1,043.00

TeleVue Ethos 13mm 100° Eyepiece - 1.25"/2"

TV-ETH-13.0
1 in stock

13mm Focal Length 100° Apparent Field of View 2" / 1.25" Hybrid Barrel 15mm Eye Relief 22.3mm Field Stop Description FAQ Specifications In the ...

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CA$1,043.00 - CA$1,043.00
CA$1,043.00
CA$1,043.00 - CA$1,043.00
CA$1,043.00
CA$1,261.00 - CA$1,261.00
CA$1,261.00
CA$1,261.00 - CA$1,261.00
CA$1,261.00

TeleVue Ethos 17mm 100° Eyepiece - 2"

TV-ETH-17.0

17mm Focal Length Ultra-Wide 100° Apparent Field of View 2" Diameter Barrel 15mm Eye Relief 29.6mm Field Stop Description Q&A Specificat...

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CA$1,261.00 - CA$1,261.00
CA$1,261.00
CA$1,261.00 - CA$1,261.00
CA$1,261.00
CA$1,417.00 - CA$1,417.00
CA$1,417.00
CA$1,417.00 - CA$1,417.00
CA$1,417.00

TeleVue Ethos 21mm 100° Eyepiece - 2"

TV-ETH-21.0
1 in stock

21mm Focal Length 100° Apparent Field of View 2" Barrel 15mm Eye Relief 36.2mm Field Stop   Description FAQ Specifications In the Box Downloa...

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CA$1,417.00 - CA$1,417.00
CA$1,417.00
CA$1,417.00 - CA$1,417.00
CA$1,417.00
CA$980.00 - CA$980.00
CA$980.00
CA$980.00 - CA$980.00
CA$980.00

TeleVue Ethos 6mm 100° Eyepiece - 1.25"/2"

TV-ETH-06.0

6mm Focal Length 100° Apparent Field of View 2" / 1.25" Hybrid Barrel 15mm Eye Relief 10.4mm Field Stop Description FAQ Specifications In the B...

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CA$980.00 - CA$980.00
CA$980.00
CA$980.00 - CA$980.00
CA$980.00
CA$980.00 - CA$980.00
CA$980.00
CA$980.00 - CA$980.00
CA$980.00

TeleVue Ethos 8mm 100° Eyepiece - 1.25"/2"

TV-ETH-08.0
1 in stock

8mm Focal Length 100° Apparent Field of View 2" / 1.25" Hybrid Barrel 15mm Eye Relief 13.9mm Field Stop Description FAQ Specifications In the B...

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CA$980.00 - CA$980.00
CA$980.00
CA$980.00 - CA$980.00
CA$980.00

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.