Diagonals

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  1. Orion 1.25in Enhanced Mirror Star Telescope Diagonal
    AUD $146.00

    In Stock

    • The precision flat mirror in this 90deg diagonal is meticulously polished to yield excellent performance
    • Anodized aluminum housings are internally blackened for high contrast views free of glare
    • Fits 1.25" telescope focusers, accepts 1.25" eyepieces
    • Enhanced Aluminum mirror coatings yield 97% reflectivity for bright clear views
    • Includes dustcaps for storage
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  2. Celestron Dielectric Star Diagonal, 2in With Twist-lock
    AUD $599.00

    In Stock

    • Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings
    • Provides a 90° viewing angle, perfect for more comfortable viewing through refractor and Cassegrain-type telescopes
    • 58 layers of dielectric coatings provide an over 99% reflective surface, ensuring the maximum amount of light collected by the telescope reaches the eyepiece
    • Twist-lock keeps the eyepiece centered in the diagonal to provide better optical alignment
    • Includes a stepdown adapter, so the diagonal accepts eyepieces, Barlow lenses, threaded filters, and other accessories in both 2” and 1.25” sizes
    • Two interchangeable adapters allow you to switch between a Schmidt-Cassegrain thread adapter and a 2” barrel adapter so you can use this diagonal with a wide variety of telescopes
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  3. Sirius 2in Dielectric Mirror Diagonal with SCT Adapter
    AUD $199.00

    In Stock

    Highest quality 2-inch Dielectric mirror diagonal with 99% reflectivity. Diagonal comes with 1.25-inch adapter and SCT adapter.

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  4. Sirius Optics Budget 90 Degree Mirror Diagonal (Plastic)
  5. Celestron 2in Mirror Diagonal with XLT
    AUD $380.00

    Backorder Available

    Out of stock

    • 2” SCT mirror diagonal with high performance XLT coatings
    • 1/10th wave mirror is tested with an interferometer to ensure quality
    • Housing is precision machined to achieve and hold good optical alignment
    • Includes a 2” to 1.25” adapter and aluminum carry case
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  6. Sirius 2in 45 Degree Prism Diagonal
    AUD $249.00

    In Stock

    Correct image 2" diagonal Learn More
  7. saxon 1.25in Erect Image Diagonal (90 degree)
    AUD $69.00

    In Stock

    Look no further than the saxon 1.25" Erect Image Diagonal (90 degree) to make your telecope do it all.


    Upright, non-mirrored images during terrestrial viewing and comfort during astronomy sessions, the saxon 1.25" Erect Image Diagonal (90 degree) will give you both.

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  8. Sirius 2in Dielectric Diagonal
    AUD $179.00

    In Stock

  9. Orion 1.25in Dielectric Twist Tight Diagonal
    AUD $289.00

    In Stock

    • 1.25", 90-degree mirror diagonal features sophisticated dielectric coatings with highly efficient 99% reflectivity for peak performance
    • Twist-tight clamping mechanism grips inserted eyepieces more securely than typical thumbscrew-equipped diagonals - without scratching!
    • Durable dielectric mirror coatings provide higher reflectivity for maximum brightness and contrast
    • Machined and anodized aluminum housing features machine-threaded glare baffles to eliminate glare for great performance
    • Nosepiece barrel threaded to accept 1.25" filters
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  10. Orion 1.25in 90 Degree Dielectric Mirror Diagonal
    AUD $199.00

    In Stock

    • 90-degree diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99 percent reflectivity
    • Dielectric mirror coatings are more durable and more reflective than enhanced aluminum coatings
    • Diagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope
    • Machined and anodized aluminum housing features machine-threaded baffles for optimized contrast
    • 1.25" nosepiece barrel is threaded to accept like-sized Orion eyepiece filters
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