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Cassegrain Telescopes

Cassegrain Telescope

Cassegrain telescopes are a type of reflecting telescope that employs a unique optical design to achieve impressive magnification while maintaining a compact form factor. They use a combination of a primary concave mirror and a secondary convex mirror, the main characteristic being that the optical path folds back onto itself. This design puts the focal point at a convenient location behind the primary mirror and the convex secondary adds a telephoto effect creating a much longer focal length in a mechanically short design.
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Cassegrain telescopes are used for their precision, versatility, and ability to provide clear and detailed views of celestial wonders.

Key Features of a Cassegrain Telescope

Compound Optical Design

Cassegrain telescopes utilise a compound optical design, combining primary and secondary mirrors to fold the light path within the telescope’s body. This design allows for a longer focal length in a shorter physical tube.

Secondary Mirror

The secondary mirror is placed near the open end of the telescope tube. It reflects light back through a hole in the primary mirror, providing a compact and convenient design.


Cassegrain telescopes are renowned for their versatility. They offer a wide range of focal lengths and are suitable for various astronomical observations, including planetary, lunar, and deep-sky observations. Whether you’re gazing at distant planets, exploring the intricate details of lunar landscapes, or embarking on a deep-sky adventure, Cassegrain telescopes deliver exceptional performance.


Despite their impressive magnification capabilities, Cassegrain telescopes maintain a portable form factor, making them ideal for both backyard stargazing and on-the-go observations. The lightweight nature of Cassegrain telescopes ensures that you can take your exploration to a variety of locations without compromising on the quality of your observations.

Types of Cassegrain Telescopes

There are two main subtypes of the Cassegrain telescope, each with its unique advantages:

Schmidt Cassegrain Telescope (SCT)

Schmidt Cassegrain telescopes utilise a corrector plate at the front of the telescope to correct spherical aberration (when light disperses instead of correctly focusing to form a sharp image), resulting in sharp images across a wide field of view. SCTs are known for their compactness and versatility.

Maksutov-Cassegrain Telescopes

Maksutov-Cassegrain telescopes feature a thicker corrector lens, which corrects for spherical aberration and chromatic aberration. These telescopes are highly valued for their high-contrast images and excellent planetary observation capabilities.

Advantages of Schmidt Cassegrain Telescopes

Schmidt Cassegrain telescopes offer a range of advantages that cater to both seasoned astronomers and newcomers to the hobby. These advantages include:

Compact Tubes

Schmidt Cassegrain telescopes are designed with compact tubes, making them incredibly portable. This feature ensures that astronomers can easily transport their telescopes to various observation sites, unlocking the potential for diverse celestial encounters.

Long Focal Lengths

The compound design of Schmidt Cassegrain telescopes allows for significantly longer focal lengths within a compact structure. This design choice contributes to exceptional planetary viewing, enabling observers to discern intricate details on distant planets.

Superior Optics

The compound optical design of Schmidt Cassegrain telescopes results in superior optics, enhancing the quality of observed images. The utilisation of mirrors instead of lenses mitigates chromatic aberrations, leading to crisp and detailed views

Buy Your Cassegrain Telescope at Sidereal Trading

At Sidereal Trading, we’re passionate about providing you with top-quality Cassegrain telescopes to enhance your astronomical journey. Our diverse range of Cassegrain telescopes, including Schmidt-Cassegrain, ensures that you’ll find the perfect instrument to suit your preferences and observation goals. Whether you’re a seasoned astronomer or a budding enthusiast, our telescopes are designed to bring the wonders of the cosmos closer to you.

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    Need Expert Advice?

    Visual Astronomy, Astrophotography, Microscopy and Macro Photography can be a little complicated sometimes as there are a lot of options. If you'd like to check something before you purchase just let us know and we'd be happy to help!

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    Cassegrain Telescope - FAQs

    What’s the difference between a refractor telescope and a reflector telescope?

    Refractor telescopes are built with lenses, providing a straight optical path from the objective lens to the eyepiece or camera. This design minimises issues like spherical aberration or coma, resulting in crisp and contrast-rich views of celestial objects. These telescopes tend to be lighter and are perfect for wide-field observing and imaging, making them an ideal choice for those who appreciate sharpness and clarity. 

    On the other hand, reflector telescopes utilise mirrors, particularly a primary mirror that serves as the objective lens and a secondary mirror that focuses the image onto the camera or eyepiece. These telescopes are larger, heavier, and often require a sturdy mount due to their construction. They offer a larger aperture, allowing more light to be collected and enabling detailed views of deep-sky objects. 

    It’s worth noting that Cassegrain telescopes, including Schmidt-Cassegrain and Maksutov-Cassegrain designs, excel in compactness and power, using both mirrors and lenses to create detailed images. 

    Does Sidereal Trading offer other equipment besides cassegrain telescopes?

    Yes, we sell other equipment, including telescope tripods, regular binoculars and astronomy binoculars Melbourne-wide. Why not also check out our lab equipment, including our biological microscope range?