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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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Tele Vue 5x Powermate - 1.25" 2
Tele Vue 5x Powermate - 1.25" 1
CA$364.00 - CA$364.00
CA$364.00
CA$364.00 - CA$364.00
CA$364.00

Tele Vue 5x Powermate - 1.25"

TV-PMT-5126
1 in stock

Magnification Factor: 5x Barrel Size: 1.25" Optical Design: 4-Element Telecentric Weight: 0.40 lbs / 181g Total Height: 3.1" / 79mm T-Ring Adapter...

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CA$364.00 - CA$364.00
CA$364.00
CA$364.00 - CA$364.00
CA$364.00
Tele Vue 60º Everbrite Diagonal - 1.25" 2
Tele Vue 60º Everbrite Diagonal - 1.25" 1
CA$517.00 - CA$517.00
CA$517.00
CA$517.00 - CA$517.00
CA$517.00

Tele Vue 60º Everbrite Diagonal - 1.25"

TV-DPC-6012

Reflectivity: 99% Everbrite Dielectric Coatings Viewing Angle: 60° Barrel Size: 1.25" Construction: Machined Aluminum Housing Eyepiece Holder: Non...

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CA$517.00 - CA$517.00
CA$517.00
CA$517.00 - CA$517.00
CA$517.00
Tele Vue 90º Enhanced Aluminum Diagonal - 1.25" 1
CA$302.00 - CA$302.00
CA$302.00
CA$302.00 - CA$302.00
CA$302.00

Tele Vue 90º Enhanced Aluminum Diagonal - 1.25"

TV-DSC-0125

Diagonal Type: 90° Mirror (Star) Barrel Size: 1.25" Reflectivity: 96% Eyepiece Holder: Brass Clamp Ring Filter Threads: Yes (1.25") Weight: 5 oz (...

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CA$302.00 - CA$302.00
CA$302.00
CA$302.00 - CA$302.00
CA$302.00
Tele Vue 90º Everbrite Diagonal - 1.25" 1
CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00

Tele Vue 90º Everbrite Diagonal - 1.25"

TV-DPC-1250

Reflectivity: 99% Dielectric Coating Substrate Material: Pyrex Barrel Size: 1.25" Optical Angle: 90° Eyepiece Holder: Non-marring Brass Clamp Ring...

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CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00
Tele Vue 90º Everbrite Diagonal 1
CA$630.00 - CA$630.00
CA$630.00
CA$630.00 - CA$630.00
CA$630.00

Tele Vue 90º Everbrite Diagonal - 2"

TV-DDP-8004
1 in stock

Reflectivity: 99% Dielectric Coatings Mirror Substrate: Pyrex Body Construction: CNC-Machined Aluminum Eyepiece Holder: Non-Marring Brass Clamp Ri...

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CA$630.00 - CA$630.00
CA$630.00
CA$630.00 - CA$630.00
CA$630.00
Tele Vue Accessory X-Y Mount 1
CA$182.00 - CA$182.00
CA$182.00
CA$182.00 - CA$182.00
CA$182.00

Tele Vue Accessory X-Y Mount

TV-AAM-0001

Independent X-Y Axis Adjustment Universal Mounting Block (MBC-1001) Included Accepts Tele Vue Starbeam, Sol-Searcher, and Piggy-Cam Mounts to Tele...

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CA$182.00 - CA$182.00
CA$182.00
CA$182.00 - CA$182.00
CA$182.00
Tele Vue BandMate H-Beta Filter
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00

Tele Vue BandMate H-Beta Filter

Options available

Filter Type: Hydrogen-Beta (Hβ) Narrowband Available Sizes: 1.25" and 2" Mounted Primary Targets: Horsehead Nebula, California Nebula Manufacturin...

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CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00
CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00

Tele Vue BandMate Nebustar Filter

Options available
1 variants in stock

Unique Narrowband Design: Transmits both Hβ and OIII emission lines in a single, targeted passband for maximum contrast. Blocks Red Wavelengths:...

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CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00
Tele Vue BandMate OIII Filter
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00

Tele Vue BandMate OIII Filter

Options available

Isolates doubly ionized oxygen (OIII) emission lines Dramatically increases contrast on planetary nebulae and supernova remnants Manufactured by A...

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CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00
Tele Vue Big Paracorr Type 2 2
Tele Vue Big Paracorr Type 2 1
CA$1,754.00 - CA$1,754.00
CA$1,754.00
CA$1,754.00 - CA$1,754.00
CA$1,754.00

Tele Vue Big Paracorr Type 2

TV-VIP-3010

Corrects Coma in Newtonian Reflectors For f/3 to f/6 Parabolic Mirrors 1.15x Magnification Factor Designed for 3-inch Focusers Prevents Vignetting...

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CA$1,754.00 - CA$1,754.00
CA$1,754.00
CA$1,754.00 - CA$1,754.00
CA$1,754.00
Tele Vue Block Adptr X-Y Mount 1
CA$35.00 - CA$35.00
CA$35.00
CA$35.00 - CA$35.00
CA$35.00

Tele Vue Block Adptr X-Y Mount

TV-MBC-1001

Function: Adapts Tele Vue X-Y Mount to Ring Mounts Compatibility: Tele Vue AAM-0001, Tele Vue Ring Mounts Material: Black Anodized Aluminum Mounti...

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CA$35.00 - CA$35.00
CA$35.00
CA$35.00 - CA$35.00
CA$35.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

Tele Vue DeLite 5mm 62° Eyepiece - 1.25"

TV-EDE-05.0
1 in stock

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

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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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
Tele Vue Delos 10mm 72° Eyepiece - 1.25" 2
Tele Vue Delos 10mm 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 10mm 72° Eyepiece - 1.25"

TV-EDL-10.0
1 in stock

CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00
Tele Vue Delos 12mm 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 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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CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00
Tele Vue Delos 14mm 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 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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CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00
Tele Vue Delos 17.3mm 72° Eyepiece - 1.25" 2
Tele Vue Delos 17.3mm 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 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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CA$613.00 - CA$613.00
CA$613.00
CA$613.00 - CA$613.00
CA$613.00

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.