Telescopes & Astronomy
Beginner Telescopes
Buying your first telescope? Browse our curated selection of beginner telescopes.
Shop by Use
What will you use your telescope for? Explore the many uses of different types of telescopes.
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Choose your telescope by optical design or learn more about the different types of telescopes.
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AUD $84.99In 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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AUD $84.99In 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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AUD $499.00Backorder Available
- 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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AUD $424.99Backorder Available
- 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
Why buy from Sirius Optics
Queensland's largest telescope showroom and warehouse
Run by astronomers and nature lovers, not sales people
Expert advice and lessons
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