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Astrographs

An astrograph is a telescope designed around a camera instead of an eyepiece. The goal is a flat field with pinpoint stars to the corners of the sensor, at a focal ratio fast enough to collect signal in a reasonable night. This collection gathers every imaging-first design we carry: refractor astrographs from Askar, William Optics, SharpStar, SVBONY and ZWO, Celestron RASA systems at f/2 to f/2.2, SharpStar HNT and SCA designs, Sky-Watcher Quattro and HAC, iOptron imaging Newtonians and the Orion Optics UK AG and ODK lines.

Choosing one is mostly about matching focal length to your camera's pixel size and to the targets you love. We are happy to do that math with you before you spend a dollar.

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CA$3,219.00 - CA$3,219.00
CA$3,219.00
CA$3,219.00 - CA$3,219.00
CA$3,219.00

Askar 107PHQ f/7 Quadruplet APO

107mm Aperture Quadruplet APO Optical Design 749mm Focal Length at f/7 44mm Corrected Image Circle for Full-Frame Sensors Integrated Field Flatten...

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CA$3,219.00 - CA$3,219.00
CA$3,219.00
CA$3,219.00 - CA$3,219.00
CA$3,219.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00

Askar 111F Flat-Field Astrograph

111mm Aperture 766mm Focal Length (f/6.9) Quadruplet Air-Spaced APO Design with ED Glass 44mm Corrected Image Circle Integrated Field Flattener Ne...

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CA$2,099.00 - CA$2,099.00
CA$2,099.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00
CA$4,899.00 - CA$4,899.00
CA$4,899.00
CA$4,899.00 - CA$4,899.00
CA$4,899.00

Askar 130PHQ f/7.7 Quadruplet APO

130mm Aperture Quadruplet APO Optics 1000mm Focal Length at f/7.7 Built-in Field Flattener 60mm Corrected Image Circle Total Assembled Weight of 1...

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CA$4,899.00 - CA$4,899.00
CA$4,899.00
CA$4,899.00 - CA$4,899.00
CA$4,899.00
Askar 131F Flat-Field APO Refractor
CA$2,799.00 - CA$2,799.00
CA$2,799.00
CA$2,799.00 - CA$2,799.00
CA$2,799.00

Askar 131F Flat-Field APO Refractor

131mm Aperture 983mm Focal Length (f/7.5) Quadruplet Air-Spaced APO Optical Design Includes One ED Glass Element 44mm Full-Frame Image Circle Inte...

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CA$2,799.00 - CA$2,799.00
CA$2,799.00
CA$2,799.00 - CA$2,799.00
CA$2,799.00
Askar 151PHQ f/7 Quadruplet Astrograph
CA$6,299.00 - CA$6,299.00
CA$6,299.00
CA$6,299.00 - CA$6,299.00
CA$6,299.00

Askar 151PHQ f/7 Quadruplet Astrograph

151mm Aperture Quadruplet APO Optics 1057mm Focal Length at f/7 Integrated Flattener for a 60mm Image Circle Includes 2 ED Glass Elements for Colo...

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CA$6,299.00 - CA$6,299.00
CA$6,299.00
CA$6,299.00 - CA$6,299.00
CA$6,299.00
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

Askar 50P f/3.8 Quadruplet APO Telescope

50mm Aperture Quadruplet APO Optics Ultra-Fast f/3.8 Focal Ratio 190mm Focal Length Natively Flat Field for APS-C Sensors Standard 55mm Back Focus...

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CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
Askar 60F Flat-Field Astrograph
CA$699.00 - CA$699.00
CA$699.00
CA$699.00 - CA$699.00
CA$699.00

Askar 60F Flat-Field Astrograph

60mm Aperture Quadruplet APO Optics 408mm Focal Length (f/6.8) 44mm Full-Frame Corrected Image Circle Integrated Field Flattener 2.4-inch Dual-Spe...

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CA$699.00 - CA$699.00
CA$699.00
CA$699.00 - CA$699.00
CA$699.00
Askar 65PHQ f/6.4 Quintuplet Flat-Field Astrograph
CA$1,259.00 - CA$1,259.00
CA$1,259.00
CA$1,259.00 - CA$1,259.00
CA$1,259.00

Askar 65PHQ f/6.4 Quintuplet Flat-Field Astrograph

65mm Aperture Quintuplet APO Optical Design 416mm Focal Length at f/6.4 Built-in Field Flattener with a 44mm Image Circle 2.8kg Total Weight Inclu...

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CA$1,259.00 - CA$1,259.00
CA$1,259.00
CA$1,259.00 - CA$1,259.00
CA$1,259.00
CA$923.00 - CA$923.00
CA$923.00
CA$923.00 - CA$923.00
CA$923.00

Askar 71F Quadruplet Flat-Field APO f/6.9

71mm Aperture Quadruplet Air-Spaced APO 490mm Focal Length at f/6.9 44mm Full-Frame Corrected Image Circle Integrated Field Flattener Design 2.4-i...

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CA$923.00 - CA$923.00
CA$923.00
CA$923.00 - CA$923.00
CA$923.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00

Askar 80PHQ f/7.5 Quadruplet APO

80mm Aperture 600mm Focal Length (f/7.5) Quadruplet APO Optics with 2 ED Elements 44mm Full-Frame Corrected Image Circle 3.9kg Optical Tube Weight...

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CA$2,099.00 - CA$2,099.00
CA$2,099.00
CA$2,099.00 - CA$2,099.00
CA$2,099.00
Askar 91F Flat-Field Astrograph
CA$1,399.00 - CA$1,399.00
CA$1,399.00
CA$1,399.00 - CA$1,399.00
CA$1,399.00

Askar 91F Flat-Field Astrograph

91mm Aperture Quadruplet APO Optics 609mm Focal Length at f/6.7 44mm Full-Frame Corrected Image Circle Integrated Field Flattener Design 3.92kg Ne...

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CA$1,399.00 - CA$1,399.00
CA$1,399.00
CA$1,399.00 - CA$1,399.00
CA$1,399.00
CA$1,329.00 - CA$1,329.00
CA$1,329.00
CA$1,329.00 - CA$1,329.00
CA$1,329.00

Askar FRA300 Pro 60mm f/5 Quintuplet APO

60mm Quintuplet APO Astrograph 300mm Focal Length at a Fast f/5 Focal Ratio 44mm Full-Frame Corrected Image Circle Integrated Petzval Corrector De...

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CA$1,329.00 - CA$1,329.00
CA$1,329.00
CA$1,329.00 - CA$1,329.00
CA$1,329.00
CA$1,679.00 - CA$1,679.00
CA$1,679.00
CA$1,679.00 - CA$1,679.00
CA$1,679.00

Askar FRA400 72mm f/5.6 Quintuplet APO

72mm Aperture Quintuplet APO Lens 400mm Focal Length at f/5.6 44mm Natively Flat Image Circle 140mm Available Back Focus from M68x1 Thread 3" Rack...

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CA$1,679.00 - CA$1,679.00
CA$1,679.00
CA$1,679.00 - CA$1,679.00
CA$1,679.00
CA$1,253.00 - CA$1,253.00
CA$1,253.00
CA$1,253.00 - CA$1,253.00
CA$1,253.00

Askar FRA400C 72mm f/5.6 Quintuplet APO

72mm Aperture Quintuplet APO Optics 400mm Focal Length at f/5.6 Covers a 44mm Full-Frame Image Circle Integrated 17-Blade Aperture (f/5.6-f/22) 2....

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CA$1,253.00 - CA$1,253.00
CA$1,253.00
CA$1,253.00 - CA$1,253.00
CA$1,253.00
CA$2,799.00 - CA$2,799.00
CA$2,799.00
CA$2,799.00 - CA$2,799.00
CA$2,799.00

Askar FRA500 90mm f/5.6 Quintuplet APO

90mm Aperture Quintuplet APO Optics 500mm Focal Length at f/5.6 Massive 55mm Natively Flat Image Circle Includes Two ED Glass Elements Total Assem...

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CA$2,799.00 - CA$2,799.00
CA$2,799.00
CA$2,799.00 - CA$2,799.00
CA$2,799.00
CA$3,639.00 - CA$3,639.00
CA$3,639.00
CA$3,639.00 - CA$3,639.00
CA$3,639.00

Askar FRA600 108mm f/5.6 Quintuplet APO

108mm Aperture 600mm Focal Length (f/5.6) Quintuplet Flat-Field APO Optical Design 66mm Corrected Image Circle 6.5kg Total Weight (including tube ...

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CA$3,639.00 - CA$3,639.00
CA$3,639.00
CA$3,639.00 - CA$3,639.00
CA$3,639.00
CA$1,538.00 - CA$1,538.00
CA$1,538.00
CA$1,538.00 - CA$1,538.00
CA$1,538.00

Askar N160 f/3.6 Newtonian

160mm Aperture Parabolic Mirror f/3.4 Corrected Focal Ratio with Included 0.95x Corrector 544mm Corrected Focal Length Carbon Fiber Tube Construct...

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CA$1,538.00 - CA$1,538.00
CA$1,538.00
CA$1,538.00 - CA$1,538.00
CA$1,538.00
CA$4,753.00 - CA$4,753.00
CA$4,753.00
CA$4,753.00 - CA$4,753.00
CA$4,753.00

Askar SQA106 106mm f/4.8 Quintuplet APO

106mm Aperture f/4.8 Focal Ratio 509mm Focal Length Quintuplet Petzval APO Optical Design with 2x SD Glass 55mm Corrected Image Circle for Medium ...

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CA$4,753.00 - CA$4,753.00
CA$4,753.00
CA$4,753.00 - CA$4,753.00
CA$4,753.00
Askar SQA130 f/4.8 Quintuplet Petzval Astrograph
CA$6,719.00 - CA$6,719.00
CA$6,719.00
CA$6,719.00 - CA$6,719.00
CA$6,719.00

Askar SQA130 f/4.8 Quintuplet Petzval Astrograph

130mm Aperture Quintuplet Petzval APO Optics 624mm Focal Length at a Fast f/4.8 Focal Ratio 55mm Corrected Image Circle for Medium Format Sensors ...

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CA$6,719.00 - CA$6,719.00
CA$6,719.00
CA$6,719.00 - CA$6,719.00
CA$6,719.00
CA$1,113.00 - CA$1,113.00
CA$1,113.00
CA$1,113.00 - CA$1,113.00
CA$1,113.00

Askar SQA55 55mm f/4.8 Quintuplet APO

55mm Aperture Quintuplet APO Astrograph Fast f/4.8 Focal Ratio & 264mm Focal Length Covers a 44mm Full-Frame Image Circle 14-Blade Aperture wi...

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CA$1,113.00 - CA$1,113.00
CA$1,113.00
CA$1,113.00 - CA$1,113.00
CA$1,113.00
CA$1,792.00 - CA$1,792.00
CA$1,792.00
CA$1,792.00 - CA$1,792.00
CA$1,792.00

Askar SQA60 Pro 60mm f/4.6 Sextuplet APO

60mm Aperture Sextuplet APO Optics 276mm Focal Length at a Fast f/4.6 44mm Full-Frame Corrected Image Circle Integrated Petzval Design with 2 SD G...

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CA$1,792.00 - CA$1,792.00
CA$1,792.00
CA$1,792.00 - CA$1,792.00
CA$1,792.00
CA$2,233.00 - CA$2,233.00
CA$2,233.00
CA$2,233.00 - CA$2,233.00
CA$2,233.00

Askar SQA70 70mm f/4.8 Quintuplet APO

70mm Aperture 336mm Focal Length (f/4.8) Quintuplet Air-Spaced Petzval APO Optical Design Contains 2 ED Glass Elements 44mm Full-Frame Corrected I...

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CA$2,233.00 - CA$2,233.00
CA$2,233.00
CA$2,233.00 - CA$2,233.00
CA$2,233.00
Askar SQA70 Pro 70mm f/4.6 Sextuplet APO
Askar SQA70 Pro 70mm f/4.6 Sextuplet APO
CA$2,632.00 - CA$2,632.00
CA$2,632.00
CA$2,632.00 - CA$2,632.00
CA$2,632.00

Askar SQA70 Pro 70mm f/4.6 Sextuplet APO

70mm Aperture 322mm Focal Length f/4.6 Focal Ratio Sextuplet Petzval APO Optical Design 44mm Full-Frame Image Circle Weighs only 3kg Descriptio...

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CA$2,632.00 - CA$2,632.00
CA$2,632.00
CA$2,632.00 - CA$2,632.00
CA$2,632.00
CA$3,353.00 - CA$3,353.00
CA$3,353.00
CA$3,353.00 - CA$3,353.00
CA$3,353.00

Askar SQA85 85mm f/4.8 Quintuplet APO

85mm Aperture 408mm Focal Length (f/4.8) Quintuplet Petzval APO Optical Design Corrects a Full-Frame (44mm) Image Circle 3.64kg Optical Tube Assem...

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CA$3,353.00 - CA$3,353.00
CA$3,353.00
CA$3,353.00 - CA$3,353.00
CA$3,353.00

Types of Astrographs

  • Refractor astrographs: Quadruplet, quintuplet and Petzval designs with built-in field correction. The easiest path to good stars: no collimation, little maintenance. Askar SQA and FRA, William Optics Cat and Pleiades, SharpStar Z4.
  • Newtonian astrographs: Large aperture at f/2.8 to f/4 for the money. They need a coma corrector and occasional collimation. SharpStar HNT, Sky-Watcher Quattro, iOptron f/4, Orion Optics UK AG.
  • RASA and HAC: Camera at the front of the tube, f/2 to f/2.2. Extremely fast, so a few minutes of exposure shows faint nebulae. Best with small, light cameras.
  • Cassegrain astrographs: Long focal length in a short tube for galaxies and planetary nebulae. Orion Optics UK ODK, SharpStar SCA, plus our Ritchey-Chrétien and Dall-Kirkham collection.

Matching Focal Length to Your Camera

Image scale (arcseconds per pixel) depends on focal length and pixel size. Most backyard skies in Canada support 1 to 2 arcseconds per pixel. Short focal lengths under 400 mm suit large nebulae and are forgiving of guiding. Above 1000 mm you need excellent guiding and a steady sky.

What We Calculate With You

  • Image scale: Focal length divided into pixel size gives arcseconds per pixel. We aim for a value your sky and mount can actually support.
  • Field of view: We show how M31, the Veil or a small galaxy group sits on your sensor at each candidate focal length.
  • Back-focus budget: We list every adapter and spacer between corrector and sensor, including filter thickness, so stars are round on day one.
  • Flexure and tilt: Fast optics show a few microns of tilt. We look at the focuser, camera connection and guiding method together.

Astrographs: Frequently Asked Questions

Can I look through an astrograph?

Many refractor astrographs work visually with a diagonal. RASA and HAC designs have no eyepiece position, and Newtonian astrographs often cannot reach focus without an extension.

Is a faster focal ratio always better?

Faster means shorter exposures, but tighter focus tolerance and more sensitivity to tilt. f/4 to f/5.5 is a comfortable middle ground for most imagers.

Refractor or Newtonian astrograph?

A refractor is simpler and holds collimation. A Newtonian gives more aperture per dollar and suits imagers who are comfortable collimating.

Ready to choose an astrograph?

Send us your camera model and target list. We will suggest a focal length, the matching corrector and the right mount.