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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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$305.00 - $305.00
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$305.00 - $305.00
$305.00

Tele Vue DeLite 11mm 62° Eyepiece - 1.25"

TV-EDE-11.0

11mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 11.7mm Field Stop Description FAQ Specificat...

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$305.00 - $305.00
$305.00
$305.00 - $305.00
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$305.00 - $305.00
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$305.00 - $305.00
$305.00

Tele Vue DeLite 13mm 62° Eyepiece - 1.25"

TV-EDE-13.0

13mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 13.8mm Field Stop Description FAQ Specificat...

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$305.00 - $305.00
$305.00
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$305.00

Tele Vue DeLite 15mm 62° Eyepiece - 1.25"

TV-EDE-15.0

15mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 16.0mm Field Stop Description FAQ Specificat...

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$305.00 - $305.00
$305.00
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$305.00

Tele Vue DeLite 18.2mm 62° Eyepiece - 1.25"

TV-EDE-18.2

18.2mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 19.1mm Field Stop Description FAQ Specific...

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$305.00 - $305.00
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$305.00

Tele Vue DeLite 3mm 62° Eyepiece - 1.25"

TV-EDE-03.0

3mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 3.2mm Field Stop Description FAQ Specificatio...

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$305.00 - $305.00
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$305.00

Tele Vue DeLite 4mm 62° Eyepiece - 1.25"

TV-EDE-04.0

4mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 4.3mm Field Stop Description FAQ Specificatio...

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$305.00 - $305.00
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Tele Vue DeLite 5mm 62° Eyepiece - 1.25"

TV-EDE-05.0

5mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 5.3mm Field Stop Description FAQ Specificatio...

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$305.00 - $305.00
$305.00
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Tele Vue DeLite 7mm 62° Eyepiece - 1.25"

TV-EDE-07.0

7mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 7.5mm Field Stop Description FAQ Specificatio...

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$305.00 - $305.00
$305.00
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$305.00

Tele Vue DeLite 9mm 62° Eyepiece - 1.25"

TV-EDE-09.0

9mm Focal Length 62° Apparent Field of View 1.25" Barrel Diameter 20mm Eye Relief 9.6mm Field Stop Description FAQ Specificatio...

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$305.00 - $305.00
$305.00
$305.00 - $305.00
$305.00
Tele Vue Delos 10mm 72° Eyepiece - 1.25" 2
Tele Vue Delos 10mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 10mm 72° Eyepiece - 1.25"

TV-EDL-10.0
1 in stock

$438.00 - $438.00
$438.00
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$438.00
Tele Vue Delos 12mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 12mm 72° Eyepiece - 1.25"

TV-EDL-12.0
2 in stock

Focal Length: 12mm Apparent Field of View: 72° Barrel Size: 1.25" Eye Relief: 20mm Field Stop Diameter: 15.0mm Coatings: Fully Multi-Coated Weight...

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$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00
Tele Vue Delos 14mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 14mm 72° Eyepiece - 1.25"

TV-EDL-14.0

Focal Length: 14mm Apparent Field of View: 72° Barrel Size: 1.25" Eye Relief: 20mm Field Stop Diameter: 17.3mm Dioptrx-Ready: Yes Description F...

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$438.00 - $438.00
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$438.00 - $438.00
$438.00
Tele Vue Delos 17.3mm 72° Eyepiece - 1.25" 2
Tele Vue Delos 17.3mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 17.3mm 72° Eyepiece - 1.25"

TV-EDL-17.3
1 in stock

Focal Length: 17.3mm Barrel Size: 1.25" Apparent Field of View: 72° Eye Relief: 20mm Field Stop Diameter: 21.2mm Weight: 0.90 lbs (408g) Descri...

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$438.00 - $438.00
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$546.42 - $546.42
$546.42
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$546.42

Tele Vue Delos 24mm 72° Eyepiece - 2"

TV-EDL-24.0

24mm Focal Length 72° Apparent Field of View 2" Diameter Barrel 22mm Eye Relief 29.6mm Field Stop Description FAQ Specifications In the Box Dow...

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$546.42 - $546.42
$546.42
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$546.42
Tele Vue Delos 3.5mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 3.5mm 72° Eyepiece - 1.25"

TV-EDL-03.5

Focal Length: 3.5mm Apparent Field of View: 72° Barrel Size: 1.25" Eye Relief: 20mm Parfocal: Yes, with most Tele Vue 1.25" eyepieces Filter Threa...

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$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00
Tele Vue Delos 4.5mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 4.5mm 72° Eyepiece - 1.25"

TV-EDL-04.5
1 in stock

Focal Length: 4.5mm Apparent Field of View: 72° Barrel Size: 1.25" Eye Relief: 20mm Field Stop Diameter: 5.6mm Description FAQ Specifications I...

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$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00
Tele Vue Delos 6mm 72° Eyepiece - 1.25" 2
Tele Vue Delos 6mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 6mm 72° Eyepiece - 1.25"

TV-EDL-06.0
1 in stock

Focal Length: 6mm Apparent Field of View: 72° Barrel Size: 1.25" Eye Relief: 20mm Optical Design: Delos Coatings: Fully Multi-Coated Weight: 1.00 ...

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$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00
Tele Vue Delos 8mm 72° Eyepiece - 1.25" 1
$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00

Tele Vue Delos 8mm 72° Eyepiece - 1.25"

TV-EDL-08.0
1 in stock

Focal Length: 8mm Apparent Field of View: 72° Eye Relief: 20mm Barrel Size: 1.25" Field Stop Diameter: 9.9mm Weight: 1.00 lbs / 454 g Descripti...

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$438.00 - $438.00
$438.00
$438.00 - $438.00
$438.00
Tele Vue Nagler T4 22mm 82° Eyepiece - 2" 2
Tele Vue Nagler T4 22mm 82° Eyepiece - 2" 1
$551.00 - $551.00
$551.00
$551.00 - $551.00
$551.00

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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$551.00 - $551.00
$551.00
$551.00 - $551.00
$551.00
Tele Vue Nagler T5 16mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T5 16mm 82° Eyepiece - 1.25" 1
$418.00 - $418.00
$418.00
$418.00 - $418.00
$418.00

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: 22.1mm Weight: 0.44 lbs (201g) Description FAQ S...

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$418.00 - $418.00
$418.00
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$418.00
$782.42 - $782.42
$782.42
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$782.42

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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$782.42 - $782.42
$782.42
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$782.42
$377.74 - $377.74
$377.74
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$377.74

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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$377.74 - $377.74
$377.74
$377.74 - $377.74
$377.74
Tele Vue Nagler T6 3.5mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T6 3.5mm 82° Eyepiece - 1.25" 1
$381.00 - $381.00
$381.00
$381.00 - $381.00
$381.00

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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$381.00 - $381.00
$381.00
$381.00 - $381.00
$381.00
Tele Vue Nagler T6 5mm 82° Eyepiece - 1.25" 2
Tele Vue Nagler T6 5mm 82° Eyepiece - 1.25" 1
$381.00 - $381.00
$381.00
$381.00 - $381.00
$381.00

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

TV-EN6-05.0

Focal Length: 5mm Apparent Field of View: 82° Barrel Size: 1.25" Eye Relief: 12mm Optical Design: Nagler Type 6 (7 elements) Weight: 7.9 oz (0.22 ...

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$381.00 - $381.00
$381.00
$381.00 - $381.00
$381.00

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.