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Reflectors

No design delivers more aperture for the money than a Newtonian reflector. A mirror is cheaper to make well than a lens, has no chromatic aberration whatsoever, and scales to sizes that would be impossible in glass — which is why almost every large amateur telescope is a reflector. David Astro carries reflectors in Canada, from fast imaging astrographs to large visual Newtonians, stocked in Canada and shipped worldwide.

The trade is collimation and a coma corrector. Both are manageable, and we will be straightforward about what each telescope actually needs.

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Explore Scientific 114mm Newtonian Reflector Telescope with Equatorial Mount
$199.99 - $199.99
$199.99
$199.99 - $199.99
$199.99

Explore Scientific 114mm Newtonian Reflector Telescope with Equatorial Mount

ES-ON11444EQ3
6 in stock

114mm (4.5") primary mirror gathers ample light for planets and bright deep-sky objects Fast f/4.4 focal ratio provides expansive, wide-field view...

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$199.99 - $199.99
$199.99
$199.99 - $199.99
$199.99
Explore Scientific 6-inch Dobsonian Reflector Telescope
$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99

Explore Scientific 6-inch Dobsonian Reflector Telescope

ES-ON15476

154mm (6-inch) Primary Mirror 1170mm Focal Length f/7.6 Focal Ratio 2-inch Crayford-style Focuser with 1.25-inch Adapter Dobsonian Mount with Spri...

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$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99
Explore Scientific 6-inch Tabletop Dobsonian Reflector Telescope
$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99

Explore Scientific 6-inch Tabletop Dobsonian Reflector Telescope

ES-ON15205TT

152mm (6-inch) primary mirror for bright, detailed views Fast f/5 focal ratio provides a wide field of view Lightweight and compact tabletop Dobso...

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$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99
Explore Scientific 8-inch Dobsonian Reflector Telescope (Red)
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99

Explore Scientific 8-inch Dobsonian Reflector Telescope (Red)

ES-ON20859RR

208mm (8-inch) Primary Mirror 1219mm Focal Length f/5.9 Focal Ratio 2-inch Crayford-style Focuser with 1.25-inch Adapter Dobsonian-style Mount Inc...

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$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99
$299.99 - $299.99
$299.99
$299.99 - $299.99
$299.99

Explore Scientific FirstLight 114mm Newtonian with EQ3 Mount

ES-FL-N114500EQ3
2 in stock

114mm (4.5") Newtonian Reflector Optics Stable EQ3-Class German Equatorial Mount Full-Size Tripod with Accessory Tray Includes Plössl Eyepiece and...

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$299.99 - $299.99
$299.99
$299.99 - $299.99
$299.99
Explore Scientific Sidara Essential 130 Telescope
$399.99 - $399.99
$399.99
$399.99 - $399.99
$399.99

Explore Scientific Sidara Essential 130 Telescope

ES-N130650-MAZ01-ST10

130mm (5.1") Newtonian Reflector Optics 650mm Focal Length (f/5) Essential Alt-Azimuth Mount Dual-Axis Slow-Motion Controls Integrated SkyAssist N...

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$399.99 - $399.99
$399.99
$399.99 - $399.99
$399.99
Explore Scientific Sidara Nano 114 Telescope
$199.99 - $199.99
$199.99
$199.99 - $199.99
$199.99

Explore Scientific Sidara Nano 114 Telescope

ES-N114500-MAZ-NANO

114mm Newtonian Reflector Optics Lightweight Nano Alt-Azimuth Mount Slow-Motion Controls for Precise Tracking Integrated SkyAssist Navigation Aid ...

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$199.99 - $199.99
$199.99
$199.99 - $199.99
$199.99
Explore Scientific Sidara Plus 150 Reflector Telescope
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99

Explore Scientific Sidara Plus 150 Reflector Telescope

ES-N150750-MAZ01

150mm Newtonian Reflector 750mm Focal Length (f/5) Nano Alt-Azimuth Mount Smooth Slow-Motion Controls SkyAssist Navigation Aid Description FAQ ...

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$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99
$458.00 - $458.00
$458.00
$458.00 - $458.00
$458.00

iOptron 150mm f/4 Imaging Newtonian

IOP-6311

150mm (6") Newtonian Reflector 600mm Focal Length Fast f/4 Focal Ratio 10:1 Dual-Speed Crayford Focuser OTA Weight: 9 lbs. 10 oz. Description F...

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$458.00 - $458.00
$458.00
$458.00 - $458.00
$458.00
$628.00 - $628.00
$628.00
$628.00 - $628.00
$628.00

iOptron 200mm f/4 Imaging Newtonian

IOP-6312

200mm (8") Newtonian Reflector 800mm Focal Length Fast f/4 Focal Ratio 10:1 Dual-Speed Crayford Focuser OTA Weight: 20 lbs 6 oz Description FAQ...

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$628.00 - $628.00
$628.00
$628.00 - $628.00
$628.00
$799.00 - $799.00
$799.00
$799.00 - $799.00
$799.00

iOptron 250mm f/4 Imaging Newtonian

IOP-6313

250mm (10") Parabolic Primary Mirror 1000mm Focal Length Fast f/4 Focal Ratio 10:1 Dual-Speed Focuser 34 lb 1 oz Optical Tube Assembly Weight D...

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$799.00 - $799.00
$799.00
$799.00 - $799.00
$799.00
$1,099.00 - $1,099.00
$1,099.00
$1,099.00 - $1,099.00
$1,099.00

iOptron 300mm f/4 Imaging Newtonian

IOP-6315

Clear Aperture: 300mm (11.8") Focal Ratio: f/4 Focal Length: 1200mm OTA Weight: 48 lbs Focuser: 10:1 dual-speed Description FAQ Specificat...

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$1,099.00 - $1,099.00
$1,099.00
$1,099.00 - $1,099.00
$1,099.00
$3,198.00 - $3,198.00
$3,198.00
$3,198.00 - $3,198.00
$3,198.00

iOptron Photron 10" Ritchey-Chretien

IOP-6114

10" (254mm) Ritchey-Chretien Optical Design 2032mm Focal Length f/8 Focal Ratio Carbon Fiber Truss Tube for Thermal Stability 3-inch, 10:1 Dual-Sp...

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$3,198.00 - $3,198.00
$3,198.00
$3,198.00 - $3,198.00
$3,198.00
$4,158.00 - $4,158.00
$4,158.00
$4,158.00 - $4,158.00
$4,158.00

iOptron Photron 12" Ritchey-Chretien

IOP-6115

12" (304mm) Ritchey-Chretien Optics 2432mm Focal Length f/8 Focal Ratio Carbon Fiber Truss Tube Design 3" Dual-Speed 10:1 Crayford Focuser 53 lb O...

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$4,158.00 - $4,158.00
$4,158.00
$4,158.00 - $4,158.00
$4,158.00
$6,699.00 - $6,699.00
$6,699.00
$6,699.00 - $6,699.00
$6,699.00

iOptron Photron 14" Ritchey-Chretien

IOP-6116

14" (355mm) Ritchey-Chretien Optical Design 2848mm Focal Length at f/8 Carbon Fiber Truss Tube for Thermal Stability Heavy-duty 3" Dual-Speed 10:1...

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$6,699.00 - $6,699.00
$6,699.00
$6,699.00 - $6,699.00
$6,699.00
$8,799.00 - $8,799.00
$8,799.00
$8,799.00 - $8,799.00
$8,799.00

iOptron Photron 16" Ritchey-Chretien

IOP-6117

16" (406mm) Aperture 3248mm Focal Length f/8 Focal Ratio Ritchey-Chretien Optical Design Carbon Fiber Truss Tube 3" 10:1 Dual-Speed Focuser Des...

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$8,799.00 - $8,799.00
$8,799.00
$8,799.00 - $8,799.00
$8,799.00
$558.00 - $558.00
$558.00
$558.00 - $558.00
$558.00

iOptron Photron 6" Ritchey-Chretien

IOP-6111
1 in stock

150mm (6") Ritchey-Chretien Optical Design 1370mm Focal Length f/9 Focal Ratio 10:1 Dual-Speed 2" Crayford Focuser 12 lbs Tube Weight Descripti...

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$558.00 - $558.00
$558.00
$558.00 - $558.00
$558.00
$1,178.00 - $1,178.00
$1,178.00
$1,178.00 - $1,178.00
$1,178.00

iOptron Photron 8" Ritchey-Chretien

IOP-6112
2 in stock

200mm (8") Ritchey-Chretien Optical Design 1624mm Focal Length at f/8 Coma-Free Optics for Flat-Field Astrophotography 2" 10:1 Dual-Speed Crayford...

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$1,178.00 - $1,178.00
$1,178.00
$1,178.00 - $1,178.00
$1,178.00
iOptron Photron™ 10-inch Ritchey-Chrétien Telescope (RC10) 3'' Focuser
$2,888.00 - $2,888.00
$2,888.00
$2,888.00 - $2,888.00
$2,888.00

iOptron Photron™ 10-inch Ritchey-Chrétien Telescope (RC10) 3'' Focuser

IOP-6113

250mm (10-inch) Ritchey-Chrétien Optical Design 2000mm Focal Length at f/8 0.46 arc second Resolving Power 3-inch Dual Speed Focuser 35 lb Steel T...

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$2,888.00 - $2,888.00
$2,888.00
$2,888.00 - $2,888.00
$2,888.00
Orion Optics UK AG10 Optical Tube Assembly
$7,106.19 - $7,217.16
$7,106.19 - $7,217.16
$7,106.19 - $7,217.16
$7,106.19

Orion Optics UK AG10 Optical Tube Assembly

Options available

250mm (10-inch) Primary Mirror 950mm Focal Length Extremely Fast f/3.8 Focal Ratio 50mm Fully Corrected Flat Image Field Carbon Fibre Sandwich Tub...

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$7,106.19 - $7,217.16
$7,106.19 - $7,217.16
$7,106.19 - $7,217.16
$7,106.19
Orion Optics UK AG12 Optical Tube Assembly
$9,466.15 - $9,606.71
$9,466.15 - $9,606.71
$9,466.15 - $9,606.71
$9,466.15

Orion Optics UK AG12 Optical Tube Assembly

Options available

300mm (12") Primary Mirror 1140mm Focal Length Fast f/3.8 Focal Ratio Carbon Fibre Sandwich Tube Construction >50mm Corrected Flat Field 3" Cer...

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$9,466.15 - $9,606.71
$9,466.15 - $9,606.71
$9,466.15 - $9,606.71
$9,466.15
Orion Optics UK AG14 Optical Tube Assembly
$11,873.79 - $12,214.10
$11,873.79 - $12,214.10
$11,873.79 - $12,214.10
$11,873.79

Orion Optics UK AG14 Optical Tube Assembly

Options available

350mm Primary Mirror Diameter 1330mm Focal Length (f/3.8) >50mm Corrected Flat Field Carbon Fibre Sandwich Tube Construction 3.4µm On-Axis Spot...

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$11,873.79 - $12,214.10
$11,873.79 - $12,214.10
$11,873.79 - $12,214.10
$11,873.79
Orion Optics UK AG16 Optical Tube Assembly
$13,945.23 - $14,566.66
$13,945.23 - $14,566.66
$13,945.23 - $14,566.66
$13,945.23

Orion Optics UK AG16 Optical Tube Assembly

Options available

400mm (16") Primary Mirror Diameter 1520mm Focal Length at a fast f/3.8 Focal Ratio Corrected Flat Field Size >50mm Carbon Fibre Sandwich Tube ...

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$13,945.23 - $14,566.66
$13,945.23 - $14,566.66
$13,945.23 - $14,566.66
$13,945.23
Orion Optics UK AG20 Optical Tube Assembly Only
$29,756.40 - $29,756.40
$29,756.40
$29,756.40 - $29,756.40
$29,756.40

Orion Optics UK AG20 Optical Tube Assembly Only

OOUK-AG20-OPTICAL-TUBE-ASSEMBLY-ONLY

Largest model in the AG Astrograph range Carbon-fibre-sandwich tube CERES 3" (76.2mm) focuser standard Built to order in the UK Description Spe...

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$29,756.40 - $29,756.40
$29,756.40
$29,756.40 - $29,756.40
$29,756.40

Newtonian Design and What It Demands

A parabolic primary and a flat diagonal secondary. Simple, efficient, and with two characteristics you have to work with rather than around.

  • Focal ratio and its consequences: Fast Newtonians around f/4 give wide bright fields for imaging but demand precise collimation and a coma corrector. Slower f/6 to f/8 designs are far more forgiving.
  • Coma: Off-axis stars take a comet shape, inherent to a parabolic mirror and increasingly obvious as focal ratio drops. A coma corrector is effectively mandatory below f/6 for imaging.
  • Collimation: Mirror alignment shifts with transport and temperature. Fast scopes need checking each session; slower ones hold for weeks.
  • Central obstruction: The secondary mirror reduces contrast slightly. Imaging Newtonians use larger secondaries to fully illuminate a sensor; visual designs minimize them.
  • Cooling: A large mirror stores heat and produces a boundary layer that softens detail until it equalizes. Rear fans reduce the wait considerably on Canadian nights.
  • Dobsonian mounting: The most practical way to support a large Newtonian for visual use, at a fraction of an equatorial's cost.

Why Choose David Astro for Reflectors

A reflector is excellent value provided you are set up to maintain it, and we would rather tell you that beforehand.

  • Collimation expectations set honestly: We tell you how often your specific focal ratio needs checking and recommend a tool that matches, so it is a two-minute routine rather than a chore.
  • Coma corrector specified with the tube: For imaging Newtonians we supply the corrector and its spacing alongside the telescope, since the field is unusable without it.
  • Focuser assessment: Stock focusers on fast Newtonians often cannot hold an imaging train squarely, and we will say when an upgrade is genuinely required.
  • Authorized dealer: Full manufacturer warranty and verified authenticity, with service in Canada.
  • Ships from Canada: Large optics delivered domestically with no duties or brokerage fees.

Reflectors in Canada — Frequently Asked Questions

How often will I need to collimate?
An f/4 imaging Newtonian benefits from a check every session. An f/6 visual scope typically holds alignment for weeks unless transported roughly. It takes about two minutes once you are practised.
Do I need a coma corrector?
For imaging below about f/6, yes — corner stars will show obvious coma otherwise. For visual use at f/5 and slower most observers are untroubled, though a corrector does improve the edge.
How long does a mirror take to cool?
A 200 mm mirror moved from a warm house to a Canadian winter night typically needs 45 minutes or more. A rear-mounted fan blowing across the mirror face reduces that substantially.
Are reflectors good for planets?
Yes, given aperture and good collimation. A well-collimated 200 mm Newtonian shows excellent planetary detail; the central obstruction costs a little contrast that extra aperture more than repays.

Considering a Newtonian?

Tell us whether it is for visual or imaging and we will specify the tube, corrector and tools. Canadian stock, worldwide shipping.