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Eyepieces & Visual

Your telescope gathers the light, but the eyepiece and diagonal decide what you actually see. A good eyepiece set can transform an average telescope, and a poor diagonal can hold back an excellent one. This collection gathers every visual accessory we carry: fixed and zoom eyepieces, Barlows and telecentric amplifiers, star diagonals, binoviewers and smartphone adapters, from Tele Vue, Explore Scientific, Baader, Celestron, SVBONY, William Optics and others.

We have spent a lot of nights comparing eyepieces at the telescope. If you tell us your telescope, your eyes and what you love to observe, we can plan a set that covers what you need without overlap.

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CA$253.00 - CA$253.00
CA$253.00
CA$253.00 - CA$253.00
CA$253.00

APM Dielectric Mirror Star Diagonal - 2"

APM 2 inch star diagonal mirror with 99% di-electric coating with fast-lockThe diagonal mirror is produced by APM-Telescopes with highest qualityOp...

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CA$253.00 - CA$253.00
CA$253.00
CA$253.00 - CA$253.00
CA$253.00
CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00

APM Illuminator for Crosshair Eyepieces

Illuminator for reticle eyepiecesModelilluminated for Reticle Eyepieces

CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00
Askar 2” High-Precision Dielectric Diagonal
CA$245.00 - CA$245.00
CA$245.00
CA$245.00 - CA$245.00
CA$245.00

Askar 2” High-Precision Dielectric Diagonal

2-inch Barrel Diameter High-Reflectivity Dielectric Mirror Coating Accepts both 2" and 1.25" Eyepieces Compatible with SCT and Refractor/Reflector...

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CA$245.00 - CA$245.00
CA$245.00
CA$245.00 - CA$245.00
CA$245.00
CA$81.00 - CA$81.00
CA$81.00
CA$81.00 - CA$81.00
CA$81.00

Baader 2.25x Q-Barlow - 1.25"

Provides 2.25x magnification in its standard 1.25" housing Lens element unscrews for ~1.3x magnification when threaded directly into an eyepiece F...

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CA$81.00 - CA$81.00
CA$81.00
CA$81.00 - CA$81.00
CA$81.00
CA$332.00 - CA$332.00
CA$332.00
CA$332.00 - CA$332.00
CA$332.00

Baader 2x VIP Modular Barlow - 1.25"

Modular 2x Barlow Design 1.25" and 2" Barrel Compatibility Integrated T-2 Threads for Imaging Designed for Full-Frame Sensor Illumination Multi-Co...

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CA$332.00 - CA$332.00
CA$332.00
CA$332.00 - CA$332.00
CA$332.00
CA$123.00 - CA$123.00
CA$123.00
CA$123.00 - CA$123.00
CA$123.00

Baader 45° Amici Prism Diagonal w/ 24mm Clear Aperture - 1.25"

Provides a correctly oriented, erect image for terrestrial viewing Comfortable 45° viewing angle Full 24mm clear aperture prevents vignetting with...

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CA$123.00 - CA$123.00
CA$123.00
CA$123.00 - CA$123.00
CA$123.00
CA$348.00 - CA$348.00
CA$348.00
CA$348.00 - CA$348.00
CA$348.00

Baader 45° Amici Prism Diagonal 45° - 2" SCT Thread

Provides a fully corrected, upright, and non-reversed image Comfortable 45° viewing angle for terrestrial observation Attaches directly to 2" SCT ...

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CA$348.00 - CA$348.00
CA$348.00
CA$348.00 - CA$348.00
CA$348.00
CA$976.00 - CA$976.00
CA$976.00
CA$976.00 - CA$976.00
CA$976.00

Baader 90° Astro-Grade Amici Prism w/ BBHS Coating - 2" ClickLock

Provides a fully corrected, non-reversed and non-inverted image Comfortable 90° viewing angle 44 mm clear aperture Sealed BBHS® hard-silver coatin...

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CA$976.00 - CA$976.00
CA$976.00
CA$976.00 - CA$976.00
CA$976.00
CA$430.00 - CA$430.00
CA$430.00
CA$430.00 - CA$430.00
CA$430.00

Baader 90° Astro-Grade Amici Prism w/ BBHS Coating - T-2

Provides erect, non-reversed images at a 90° viewing angle 31 mm clear aperture Baader BBHS® silver and Phantom Group® anti-reflection coatings 47...

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CA$430.00 - CA$430.00
CA$430.00
CA$430.00 - CA$430.00
CA$430.00
CA$426.00 - CA$426.00
CA$426.00
CA$426.00 - CA$426.00
CA$426.00

Baader 90° Erecting Prism Diagonal - 2"

Provides a fully erect, non-reversed image 90° viewing angle for comfortable observing 2" barrel for use with large focusers Includes a 2" to 1.25...

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CA$426.00 - CA$426.00
CA$426.00
CA$426.00 - CA$426.00
CA$426.00
CA$161.00 - CA$161.00
CA$161.00
CA$161.00 - CA$161.00
CA$161.00

Baader 90° Prism Diagonal w/ 32mm Prism - T-2

90° comfortable viewing angle Large 32mm prism for full field illumination Baader T-2 thread system for modular connections Excellent for use with...

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CA$161.00 - CA$161.00
CA$161.00
CA$161.00 - CA$161.00
CA$161.00
CA$198.00 - CA$198.00
CA$198.00
CA$198.00 - CA$198.00
CA$198.00

Baader 90° Zenith Prism Diagonal w/ 32mm Prism - 1.25"

90° Zenith Prism Diagonal Oversized 32mm Prism 1.25" Barrel Format Baader T-2 System Threads Includes 1.25" Eyepiece Holder & Nosepiece Des...

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CA$198.00 - CA$198.00
CA$198.00
CA$198.00 - CA$198.00
CA$198.00
CA$15.00 - CA$15.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00

Baader Auxillary-Ring for Adaptation of MaxBright II

Creates the shortest possible connection for a MaxBright II Binoviewer Designed for direct attachment to any Baader T-2 star diagonal Prevents uni...

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CA$15.00 - CA$15.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00
CA$706.00 - CA$706.00
CA$706.00
CA$706.00 - CA$706.00
CA$706.00

Baader BBHS Prism Adjustable Star Diagonal - 2"

90° prism diagonal for comfortable viewing BaK4 prism with sealed Broad Band Hard Silver (BBHS®) coating Baader 2-inch ClickLock® self-centering e...

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CA$706.00 - CA$706.00
CA$706.00
CA$706.00 - CA$706.00
CA$706.00
CA$695.00 - CA$695.00
CA$695.00
CA$695.00 - CA$695.00
CA$695.00

Baader Carl Zeiss 2x Abbe Barlow Lens - 1.25" w/ ClickLock

2x Nominal Magnification Factor Legendary Carl Zeiss Abbe Optical Design Multi-Layer Coatings with 0.2% Reflection Loss 1.25" Baader ClickLock Eye...

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CA$695.00 - CA$695.00
CA$695.00
CA$695.00 - CA$695.00
CA$695.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00

Baader Classic Ortho 10mm Eyepiece - 1.25"

10mm Focal Length 52° Apparent Field of View Classic 4-Element Orthoscopic Design HT Multi-Coated Optics Safe for Solar Projection 1.25" Barrel ...

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CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00

Baader Classic Ortho 18mm Eyepiece - 1.25"

18mm Focal Length 52° Apparent Field of View Classic 4-Element Orthoscopic Design 1.25" Barrel Diameter Engineered for Safe Solar Projection HT Mu...

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CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00

Baader Classic Ortho 6mm Eyepiece - 1.25"

Classic Orthoscopic Optical Design 6mm Focal Length for High Magnification Optimized for High-Contrast Planetary Viewing Safe for Solar Projection...

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CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$99.00 - CA$99.00
CA$99.00
CA$99.00 - CA$99.00
CA$99.00

Baader Classic Plossl 32mm Eyepiece - 1.25"

32mm Focal Length 1.25" Barrel Diameter HT Multi-Coated Optics Optimized for Maximum True Field of View Heat-Resistant Cement for Solar Projection...

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CA$99.00 - CA$99.00
CA$99.00
CA$99.00 - CA$99.00
CA$99.00
CA$332.00 - CA$332.00
CA$332.00
CA$332.00 - CA$332.00
CA$332.00

Baader FlipMirror II Star Diagonal

Instantly switch between three different instrument ports Straight-through port for primary camera or spectrograph 90° mirrored port for visual ob...

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CA$332.00 - CA$332.00
CA$332.00
CA$332.00 - CA$332.00
CA$332.00
CA$1,063.00 - CA$1,063.00
CA$1,063.00
CA$1,063.00 - CA$1,063.00
CA$1,063.00

Baader Fluorite Flatfield Converter

Genuine Calcium Fluorite (CaF2) Two-Element Cemented Design Delivers a Flat Image Field of Its Own Variable Magnification Factor Achieved by Adjus...

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CA$1,063.00 - CA$1,063.00
CA$1,063.00
CA$1,063.00 - CA$1,063.00
CA$1,063.00
CA$178.00 - CA$193.00
CA$178.00 - CA$193.00
CA$178.00 - CA$193.00
CA$178.00

Baader Glasspath Corrector for Maxbright Bino and Mark V

Corrects for insufficient back focus to allow binoviewer use Available in 1.25x, 1.7x, and 2.6x magnification factors Removes prism-induced colour...

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CA$178.00 - CA$193.00
CA$178.00 - CA$193.00
CA$178.00 - CA$193.00
CA$178.00
CA$241.00 - CA$241.00
CA$241.00
CA$241.00 - CA$241.00
CA$241.00

Baader Hyperion 68° 10mm Eyepiece - 1.25"/2"

10mm Focal Length 68° Apparent Field of View Modular Dual 1.25" and 2" Barrel Design 8 Lens Elements in 5 Groups Baader Phantom Group Multi-Coatin...

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CA$241.00 - CA$241.00
CA$241.00
CA$241.00 - CA$241.00
CA$241.00
CA$241.00 - CA$241.00
CA$241.00
CA$241.00 - CA$241.00
CA$241.00

Baader Hyperion 68° 13mm Eyepiece - 1.25"/2"

13mm Focal Length 68° Apparent Field of View Dual 1.25" and 2" Barrel Design 8 Lens Elements in 5 Groups 20mm Eye Relief Integrated M43 and SP54 C...

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CA$241.00 - CA$241.00
CA$241.00
CA$241.00 - CA$241.00
CA$241.00

Building a Visual Kit

  • Low power: A wide-field eyepiece giving a 4 to 6 mm exit pupil for finding objects and framing large clusters and nebulae.
  • Medium power: The workhorse for galaxies, globular clusters and planetary nebulae, around a 2 to 3 mm exit pupil.
  • High power: For planets, the Moon and double stars, typically 0.5 to 1 mm exit pupil, limited by seeing.
  • Barlow or zoom: A 2x Barlow doubles the useful range of your set. A zoom eyepiece covers many magnifications in one.
  • Diagonal: A dielectric diagonal is brighter and more durable than a basic aluminium mirror.

Exit Pupil Explained

Divide the eyepiece focal length by the telescope's focal ratio to get the exit pupil in millimetres. A 24 mm eyepiece at f/6 gives 4 mm. This number predicts how bright and how magnified a view will be better than magnification alone.

How We Plan Your Set

  • Spaced magnifications: We space focal lengths so each eyepiece does a different job.
  • Eye relief: Glasses wearers need 15 to 20 mm of eye relief. We point out models that work with glasses.
  • Barrel size: 2-inch barrels allow wider low-power fields if your focuser and diagonal accept them.

Eyepieces and Visual: Frequently Asked Questions

How many eyepieces do I need?

Three or four well-chosen eyepieces, plus a Barlow, cover almost everything.

What is the highest useful magnification?

About 2x the aperture in mm on a very steady night, but in most Canadian seeing, 150x to 250x is the practical limit.

Is a premium eyepiece worth it?

In a fast telescope, yes: wide-field premium eyepieces stay sharp to the edge where cheaper designs blur. In a slow f/10 or f/12 telescope, mid-range eyepieces perform very well.

Planning an eyepiece set?

Tell us your telescope and what you observe most. We will suggest a short, well-spaced set.