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Optical Accessories

Optical accessories are what turn one telescope into several. The same optical tube can be a wide-field imaging refractor, a high-power planetary instrument or a comfortable binocular-view visual scope depending on what you put behind it. David Astro carries a deep selection of eyepieces, diagonals, Barlows, reducers, flatteners, binoviewers and correctors in Canada, held in Canadian stock.

Our team uses this equipment on our own telescopes, so the advice you get is based on what actually works at a given focal ratio and under a given sky, not on a spec sheet. If you are deciding between two focal lengths or wondering whether a corrector will help your optic, ask us before you order.

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CA$771.00 - CA$771.00
CA$771.00
CA$771.00 - CA$771.00
CA$771.00

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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CA$771.00 - CA$771.00
CA$771.00
CA$771.00 - CA$771.00
CA$771.00
Tele Vue Delos 3.5mm 72° Eyepiece - 1.25" 1
CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00

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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CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00
Tele Vue Delos 4.5mm 72° Eyepiece - 1.25" 1
CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00

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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CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00
Tele Vue Delos 6mm 72° Eyepiece - 1.25" 2
Tele Vue Delos 6mm 72° Eyepiece - 1.25" 1
CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00

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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CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00
Tele Vue Delos 8mm 72° Eyepiece - 1.25" 1
CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00

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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CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00
Tele Vue Dovetail for QRB-1002 1
CA$48.00 - CA$48.00
CA$48.00
CA$48.00 - CA$48.00
CA$48.00

Tele Vue Dovetail for QRB-1002

TV-QRD-1006
1 in stock

Accessory Mounting Plate Vixen-Style Dovetail Profile Designed for Tele Vue QRB-1002 Quick Release Bracket Attaches to Telescope Optical Tube or R...

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CA$48.00 - CA$48.00
CA$48.00
CA$48.00 - CA$48.00
CA$48.00
Tele Vue Finderscope Adapter Brkt 1
CA$42.00 - CA$42.00
CA$42.00
CA$42.00 - CA$42.00
CA$42.00

Tele Vue Finderscope Adapter Brkt

TV-FAB-1008

Mounting Platform: Attaches Tele Vue finders to Tele Vue focusers Compatibility: Tele Vue Starbeam, Sol-Searcher, and Qwik-Point finders Attaches ...

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CA$42.00 - CA$42.00
CA$42.00
CA$42.00 - CA$42.00
CA$42.00
Tele Vue Flip-Mirror only (to upgrade older models) 1
CA$48.00 - CA$48.00
CA$48.00
CA$48.00 - CA$48.00
CA$48.00

Tele Vue Flip-Mirror only (to upgrade older models)

TV-SFM-1005

Mechanism: Kinematic, locking flip-mirror Primary Port: Straight-through optical path Secondary Port: 90° reflected path with helical focuser Focu...

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CA$48.00 - CA$48.00
CA$48.00
CA$48.00 - CA$48.00
CA$48.00
Tele Vue Large Field Corrector- NP101-NP101is-NP127is 2
Tele Vue Large Field Corrector- NP101-NP101is-NP127is 1
CA$480.00 - CA$480.00
CA$480.00
CA$480.00 - CA$480.00
CA$480.00

Tele Vue Large Field Corrector- NP101-NP101is-NP127is

TV-LCL-1069

Corrects Field Curvature for Large Format Sensors Designed for Tele Vue NP101, NP101is, and NP127is Telescopes Fully Illuminates Sensors up to 52m...

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CA$480.00 - CA$480.00
CA$480.00
CA$480.00 - CA$480.00
CA$480.00
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: 22.1mm Weight: 0.44 lbs (201g) 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: 7.9 oz (0.22 ...

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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: 0.50 lbs / 227 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: 0.42 lbs / 190 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 - 2"

TV-EN7-14.0

Focal Length: 14mm Apparent Field of View: 82° Barrel Size: 2" Eye Relief: 19mm Field Stop Diameter: 20.5mm Weight: 1.23 lbs (19.7 oz) Descript...

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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 - 2"

TV-EN7-19.0
1 in stock

Focal Length: 19mm Apparent Field of View: 82° Barrel Size: 2" Eye Relief: 19mm Field Stop Diameter: 27.1mm Weight: 1.28 lbs (20.5 oz) Descript...

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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"/2"

TV-EN7-05.5

Focal Length: 5.5mm Apparent Field of View: 82° Barrel Size: 1.25"/2" Eye Relief: 19mm Field Stop Diameter: 8.1mm Weight: 1.29 lbs (20.6 oz) De...

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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"/2"

TV-EN7-09.0

Focal Length: 9mm Apparent Field of View: 82° Barrel Size: 1.25"/2" Eye Relief: 19mm Field Stop Diameter: 13mm Weight: 1.21 lbs (19.4 oz) Descr...

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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 50° Eyepiece - 1.25"

TV-ENZ-0306

Focal Length: 3mm to 6mm Zoom Apparent Field of View: 50° (Constant) Barrel Size: 1.25" Eye Relief: 10mm Field Stop Diameter: 5.1mm (at 6mm) - 2.6...

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CA$682.00 - CA$682.00
CA$682.00
CA$682.00 - CA$682.00
CA$682.00
Tele Vue NP101is Accessory Package 1
CA$1,067.00 - CA$1,067.00
CA$1,067.00
CA$1,067.00 - CA$1,067.00
CA$1,067.00

Tele Vue NP101is Accessory Package

TV-TVP-4058

For the Tele Vue NP101is (telescope not included) 4" Ring Mount - Satin (RS4-8004) 2" 90° Everbrite Diagonal with 2"-1.25" HiHat Adapter (DDP-8004...

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CA$1,067.00 - CA$1,067.00
CA$1,067.00
CA$1,067.00 - CA$1,067.00
CA$1,067.00
Tele Vue NP127is Accessory Package 1
CA$1,247.00 - CA$1,247.00
CA$1,247.00
CA$1,247.00 - CA$1,247.00
CA$1,247.00

Tele Vue NP127is Accessory Package

TV-TVP-5056

For the Tele Vue NP127is (telescope not included) Mounting Ring Set for 5" Tube, with BPL-1098 Bottom Plate (MRS-5000) 2" 90° Everbrite Diagonal w...

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CA$1,247.00 - CA$1,247.00
CA$1,247.00
CA$1,247.00 - CA$1,247.00
CA$1,247.00

Choosing Optical Accessories That Match Your Telescope

Every accessory in this collection modifies the light cone before it reaches your eye or sensor. The right choice depends almost entirely on your telescope's focal ratio, focal length and back-focus budget.

  • Eyepieces: Focal length sets magnification against your telescope's focal length; apparent field and eye relief determine how comfortable that magnification is to use.
  • Diagonals: Dielectric mirrors typically exceed 99% reflectivity; prisms can outperform them at f/10 and slower on planetary targets but introduce chromatic effects in fast refractors.
  • Barlow lenses and extenders: Multiply focal length for planetary work and push the focal plane outward, which is often the cheapest fix for a scope that will not reach focus with a diagonal.
  • Field flatteners and reducers: Correct field curvature and coma across large sensors; each has a fixed back-focus that must be hit precisely.
  • Binoviewers: Two-eye viewing that dramatically improves perceived detail on the Moon and planets, at the cost of significant added optical path.
  • Finders and reflex sights: Acquisition optics — the accessory most often skipped and most often missed.

Why Choose David Astro for Optical Accessories

Optics are easy to buy badly. A well-reviewed eyepiece can still be the wrong eyepiece for your focal ratio, exit pupil or sky.

  • Focal length guidance: We help you build a spaced eyepiece set rather than three focal lengths that overlap, and we calculate exit pupil against your aperture and typical seeing.
  • Corrector matching: We confirm that a flattener or reducer is designed for your telescope's focal ratio before you buy, since a mismatched corrector degrades a field rather than fixing it.
  • Authorized dealer: Full manufacturer warranty and verified authenticity on everything we list.
  • Canadian stock: In-stock optics ship from Canada, with no surprise duties or brokerage fees for Canadian customers.
  • Service and support after the sale: In-house diagnostics if something is not performing as expected.

Optical Accessories in Canada — Frequently Asked Questions

Will a premium eyepiece improve a modest telescope?
Usually yes at the edges of the field, especially in fast telescopes below f/6 where simpler designs struggle. On the axis at f/10, the difference between a good eyepiece and a premium one is much smaller.
How do I know if I need a flattener or a reducer?
A flattener corrects curvature at the same focal length. A reducer also shortens focal length, widening the field and speeding the system. If your stars are elongated only in the corners, you need a flattener; if you also want more field, a reducer.
Do binoviewers work in every telescope?
They add roughly 100 mm or more of optical path, so most refractors need a corrector or a Barlow-style element to reach focus. Schmidt-Cassegrains generally accommodate them without modification.
Is everything shipped domestically?
Yes. Anything shown as in stock is held in Canada and ships without customs delays for Canadian orders.

Match the accessory to the optic

Tell us your telescope and what you want to see, and we will recommend the right combination. Ships from Canada.