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Diagonals

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  1. Sirius 1.25" Mirror Diagonal
  2. Celestron 2" Mirror Diagonal with XLT
    AUD $380.00

    In 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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  3. Sirius 2" 45 Degree Erecting Prism
    AUD $249.00

    Backorder Available

  4. saxon 1.25" Erect Image Diagonal (90 degree)
    AUD $69.00

    Backorder Available

    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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  5. Sirius 2" Dielectric Diagonal
  6. Celestron 1.25" Visual Back for SCT
    AUD $39.00

    In Stock

    • Threads onto the rear of Celestron 5” - 11” Schmidt-Cassegrain telescopes.
    • Accepts any accessory with a 1.25” insert barrel, including diagonals, eyepieces, Barlows, and other adapters
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  7. Orion 1.25" Dielectric Twist Tight Diagonal
    AUD $229.00

    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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  8. Orion 2" Twist Tight Dielectric Diagonal
    AUD $399.00

    In Stock

    • This 2", 90-degree mirror diagonal features sophisticated dielectric coatings with highly efficient 99% reflectivity
    • Twist-tight clamping mechanism grips inserted eyepieces more securely than typical thumbscrew-equipped diagonals - without scratches!
    • Dielectric mirror coatings provide higher reflectivity for maximum brightness and contrast with more durability than enhanced aluminum coatings
    • Machined and anodized aluminum housing features machine-threaded glare baffles for peak performance
    • Nosepiece barrel is threaded to accept 2" filters, and a step-down 2"-1.25" adapter is included
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  9. Sirius 45 Degree Prism Diagonal
    AUD $60.00

    Backorder Available

  10. Celestron 1.25" 45 Degree Erect Image Diagonal
    AUD $79.00

    In Stock

    • A great accessory for daytime terrestrial viewing with your telescope
    • This 1.25” diagonal produces right side up and left-to-right correct images when used with refractors and catadioptric (Schmidt-Cassegrain) telescopes
    • Inserts into 1.25” focusers or visual backs; accepts standard 1.25” eyepieces
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