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Astro Dog – Australia's Online Telescope Shop
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  • Brands
    • Ainsworth Diestone Products
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  • Telescopes, Mounts & Binoculars
    • Binoculars
    • Telescopes (Complete)
      • Reflectors
      • Refractors
    • Telescopes (OTA’s)
      • Reflectors (OTA)
      • Refractors (OTA)
    • Mounts (ALT/AZ, EQ, GOTO)
  • Eyepieces
    • By Manufacturer
      • Aquila
      • Baader
      • Explore Scientific
      • Fujiyama
      • Kson
      • Masuyama
    • By Focal Length
      • ULTRA LOW POWER (33mm+)
      • LOW POWER (24mm -32mm)
      • MEDIUM POWER (11-23mm)
      • HIGH POWER (4-10mm)
    • By Type
      • Abbe Orthoscopic
      • Erfle
      • Kellner
      • Plossl
      • Barlows
      • Specialised Eyepieces
    • By Size
      • 0.965″
      • 1.25″
      • 2″
      • 3″
  • Filters
    • Achromat + Semi APO
    • Narrowband
    • UHC/O-III
    • Visual, Moon, Neutral Density
  • Accessories
    • 0.965″ Classic Accessories
    • Astronomy Lighting, Headlamps and Torches
    • Bahtinov Masks / Fishbone Calibrators
    • Barlows
    • Cables, Leads and Controllers
      • 12V Power Control
      • EQDIR / Mount Control
    • Cleaning and Protection
    • Collimation Tools
    • Dew Control
      • 12V Dew Controller Units
      • Heater Straps
    • Diagonals (45° 90°, Correct Image)
    • Diestone / Plaster
    • Eyepiece Adaptors and Spacers
      • Eyepiece Adaptors
      • Phone adaptors / Astrophotography
      • Spacers
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    • Finders
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    • Moisture/Humidity Control
    • Parts
      • Secondary Mirrors
    • Polishing Compounds
      • Steel
      • Stainless Steel
      • Gold
      • Non-Ferrous Metals
      • Hard Steel
      • Silver
      • Plastic
      • Chromium
      • Pre-Polishing
      • Polishing
      • Mirror Polishing
    • Rings
    • Vixen Style Adaptors, Dovetails, Clamps
  • Astrophotography
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Diagonals (45° 90°, Correct Image)

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  • Aquila (90° / 90 Degree) Mirror Star Diagonal (dielectric, 1.25″) for TelescopeAquila (90° / 90 Degree) Mirror Star Diagonal (dielectric, 1.25″) for Telescope Quick View
    • Aquila (90° / 90 Degree) Mirror Star Diagonal (dielectric, 1.25″) for TelescopeAquila (90° / 90 Degree) Mirror Star Diagonal (dielectric, 1.25″) for Telescope Quick View
    • Accessories, All, Aquila Optical Equipment, Brands, Diagonals (45° 90°, Correct Image)
    • Aquila (90° / 90 Degree) Mirror Star Diagonal (dielectric, 1.25″) for Telescope

    • $49.95
    • Add to cart
  • Baader Zenith Prism Diagonal T-2/32 Diagonal with focusing 1¼” eyepiece clamp (#2458125) and 1¼” nose piece (#2458105) Quick View
    • Baader Zenith Prism Diagonal T-2/32 Diagonal with focusing 1¼” eyepiece clamp (#2458125) and 1¼” nose piece (#2458105) Quick View
    • Accessories, All, Baader GERMANY, Brands, Diagonals (45° 90°, Correct Image)
    • Baader Zenith Prism Diagonal T-2/32 Diagonal with focusing 1¼” eyepiece clamp (#2458125) and 1¼” nose piece (#2458105)

    • $218.95
    • Add to cart
  • Aquila 1.25″ 90 Degree Prism Star DiagonalAquila 1.25″ 90 Degree Prism Star Diagonal Quick View
    • Aquila 1.25″ 90 Degree Prism Star DiagonalAquila 1.25″ 90 Degree Prism Star Diagonal Quick View
    • Accessories, All, Brands, Diagonals (45° 90°, Correct Image), Kson Electronics
    • Aquila 1.25″ 90 Degree Prism Star Diagonal

    • $49.95
    • Rated 5.00 out of 5
    • Add to cart
  • 2″ Diagonal (Dielectric, 99% Reflectivity) Metal, Solid Build2″ Diagonal (Dielectric, 99% Reflectivity) Metal, Solid Build Quick View
    • Sale!
      2″ Diagonal (Dielectric, 99% Reflectivity) Metal, Solid Build2″ Diagonal (Dielectric, 99% Reflectivity) Metal, Solid Build Quick View
    • All, Aquila Optical Equipment, Brands, Diagonals (45° 90°, Correct Image)
    • 2″ Diagonal (Dielectric, 99% Reflectivity) Metal, Solid Build

    • $199.95 Original price was: $199.95.$179.95Current price is: $179.95.
    • Rated 5.00 out of 5
    • Add to cart
  • Aquila Optics 90° Degree dielectric fully metal mirror star diagonal for telescope (fully metal)Aquila Optics 90° Degree dielectric fully metal mirror star diagonal for telescope (fully metal) Quick View
    • Sale!
      Aquila Optics 90° Degree dielectric fully metal mirror star diagonal for telescope (fully metal)Aquila Optics 90° Degree dielectric fully metal mirror star diagonal for telescope (fully metal) Quick View
    • Accessories, All, Brands, Diagonals (45° 90°, Correct Image), Kson Electronics
    • Aquila Optics 90° Degree dielectric fully metal mirror star diagonal for telescope (fully metal)

    • $119.95 Original price was: $119.95.$89.95Current price is: $89.95.
    • Add to cart
  • 2″ Star Diagonal 2 Inch 95%+ Reflectivity with 1.25″ adaptors2″ Star Diagonal 2 Inch 95%+ Reflectivity with 1.25″ adaptors Quick View
    • 2″ Star Diagonal 2 Inch 95%+ Reflectivity with 1.25″ adaptors2″ Star Diagonal 2 Inch 95%+ Reflectivity with 1.25″ adaptors Quick View
    • Accessories, All, Aquila Optical Equipment, Brands, Diagonals (45° 90°, Correct Image)
    • 2″ Star Diagonal 2 Inch 95%+ Reflectivity with 1.25″ adaptors

    • $149.95
    • Rated 5.00 out of 5
    • Add to cart
  • 45° Degree “Correct Image” Prism Diagonal for Telescope (Flips view upright) Quick View
    • 45° Degree “Correct Image” Prism Diagonal for Telescope (Flips view upright) Quick View
    • Accessories, All, Brands, Diagonals (45° 90°, Correct Image), Kson Electronics
    • 45° Degree “Correct Image” Prism Diagonal for Telescope (Flips view upright)

    • $49.95
    • Add to cart
  • Kson 2″ Mirror Diagonal 99% ReflectivityKson 2″ Mirror Diagonal 99% Reflectivity Quick View
    • Kson 2″ Mirror Diagonal 99% ReflectivityKson 2″ Mirror Diagonal 99% Reflectivity Quick View
    • Accessories, All, Aquila Optical Equipment, Brands, Diagonals (45° 90°, Correct Image)
    • Kson 2″ Mirror Diagonal 99% Reflectivity

    • $179.95
    • Add to cart
  • Aquila Optics 45° Degree fully metal prism star diagonal for telescope (correct image, fully metal)Aquila Optics 45° Degree fully metal prism star diagonal for telescope (correct image, fully metal) Quick View
    • Sale!
      Aquila Optics 45° Degree fully metal prism star diagonal for telescope (correct image, fully metal)Aquila Optics 45° Degree fully metal prism star diagonal for telescope (correct image, fully metal) Quick View
    • Accessories, All, Brands, Diagonals (45° 90°, Correct Image), Kson Electronics
    • Aquila Optics 45° Degree fully metal prism star diagonal for telescope (correct image, fully metal)

    • $119.95 Original price was: $119.95.$89.95Current price is: $89.95.
    • Add to cart
  • Kson Twist Lock 90 Degree 1.25″ Metal DiagonalKson Twist Lock 90 Degree 1.25″ Metal Diagonal Quick View
    • Kson Twist Lock 90 Degree 1.25″ Metal DiagonalKson Twist Lock 90 Degree 1.25″ Metal Diagonal Quick View
    • Accessories, All, Astro Essentials, Brands, Diagonals (45° 90°, Correct Image)
    • Kson Twist Lock 90 Degree 1.25″ Metal Diagonal

    • $129.95
    • Who says telescopes are only for night time sky viewing? With the saxon 1.25" Erect Image Diagonal (45 degree) you can use your favourite Refractor or Maksutov-Cassegrain telescopes for terrestrial observation in the daytime. The saxon 1.25" Erect Image Diagonal (45 degree) is ideal for when you need your telescope is a horizontal position, giving you a comfortable viewing angle and an upright, non-mirrored image.
    • Add to cart
  • Astro Essentials 1.25″ 90º Mirror Diagonal Quick View
    • Sale!
      Astro Essentials 1.25″ 90º Mirror Diagonal Quick View
    • Accessories, All, Astro Essentials, Brands, Diagonals (45° 90°, Correct Image)
    • Astro Essentials 1.25″ 90º Mirror Diagonal

    • $59.95 Original price was: $59.95.$54.95Current price is: $54.95.
    • Who says telescopes are only for night time sky viewing? With the saxon 1.25" Erect Image Diagonal (45 degree) you can use your favourite Refractor or Maksutov-Cassegrain telescopes for terrestrial observation in the daytime. The saxon 1.25" Erect Image Diagonal (45 degree) is ideal for when you need your telescope is a horizontal position, giving you a comfortable viewing angle and an upright, non-mirrored image.
    • Add to cart
  • Saxon 45° 1.25″ “Correct Image” Erect Image Diagonal star diagonal for telescope Quick View
    • Sale!
      Saxon 45° 1.25″ “Correct Image” Erect Image Diagonal star diagonal for telescope Quick View
    • Accessories, All, Brands, Diagonals (45° 90°, Correct Image), Kson Electronics
    • Saxon 45° 1.25″ “Correct Image” Erect Image Diagonal star diagonal for telescope

    • $69.95 Original price was: $69.95.$64.95Current price is: $64.95.
    • Who says telescopes are only for night time sky viewing? With the saxon 1.25" Erect Image Diagonal (45 degree) you can use your favourite Refractor or Maksutov-Cassegrain telescopes for terrestrial observation in the daytime. The saxon 1.25" Erect Image Diagonal (45 degree) is ideal for when you need your telescope is a horizontal position, giving you a comfortable viewing angle and an upright, non-mirrored image.
    • Add to cart

Average rating

  • Rated 5 out of 5 (3)

Advice and Help

  • What makes dealing with Astro Dog different? – Our Ideas
  • Why don’t we sell ‘cheap’ telescopes?
  • Which of these Telescopes Would We Recommend? NONE OF THEM!
  • 8 things to do to get the best out of an Achromatic Refractor
  • Astro Dog Kson Telescopes Overview

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