Diagonals

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  1. Celestron 1.25 Inch 45 Degree Erect Image Diagonal
    AUD $94.99

    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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  2. Celestron 1.25 Inch 90 Degree Prism Star Diagonal
    AUD $94.99

    In Stock

    • Fits telescopes with 1.25” focusers or visual backs, 90° viewing angle, best for observing objects overhead
    • Accepts standard 1.25” eyepieces, Barlow lenses, and other accessories with a 1.25” insert barrel
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  3. Sirius Optics Budget 90 Degree Mirror Diagonal (Plastic)
  4. Sirius 45 Degree Prism Diagonal
    AUD $60.00

    In Stock

     Easily add versatility to your astronomical telescope

    Great to convert your telescope for terrestrial viewing

    Suitable for refractor or catadioptric reflector telescopes

    See land images upright and non-mirrored

    45-degree angle design for comfortable viewing

    Attaches to any 1.25" eyepiece

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  5. Orion 1.25 Inch 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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  6. Orion 1.25 Inch Deluxe 45-degree Correct-Image Prism Diagonal
    AUD $199.00

    In Stock

    • Turn any refractor or Cassegrain telescope into a high-performance daytime spotting scope with our Deluxe 45-deg Correct-Image Diagonal
    • High-quality prism diagonal provides a comfortable, 45-deg viewing orientation for great daytime terrestrial views
    • Sporting a 27mm clear aperture, multi-coated prism, our Deluxe 45-deg Correct-Image Diagonal provides sharp views that are right-side-up and correct left-to-right
    • 3 arcsecond tolerance prism is 35% larger than prisms used in other models, providing a wider, more pleasing view
    • Not recommended for use with Newtonian reflector telescopes
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  7. Sirius 90 Degree Mirror Diagonal 1.25 Inch
    AUD $80.00

    Backorder Available

  8. Sirius 2 inch 45 Degree Prism Diagonal
    AUD $249.00

    Backorder Available

    Out of stock

    Correct image 2" diagonal Learn More
  9. Celestron 2 inch Mirror Diagonal with XLT
    AUD $499.00

    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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  10. Sirius 2 Inch Dielectric Mirror Diagonal with SCT Adapter
    AUD $199.00

    Backorder Available

    Out of stock

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

    Learn More

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