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Discover the Heliostar 100Hα: A Revolutionary Solar Telescope

On November 29, 2025, Sightron Japan will launch the much-anticipated Hα solar telescope, the Heliostar 100Hα. This specialized telescope is designed explicitly for solar observation, allowing users to witness the sun's dynamic features such as prominences with exceptional detail. Pre-orders for this innovative product will commence on November 25, 2025, at 11 AM, making it an exciting addition for astronomy enthusiasts.

Key Features

The Heliostar 100Hα boasts a significant 100mm aperture that delivers outstanding resolution and contrast, enhanced by its high-performance etalon filter. This feature enables the telescope to safely observe solar prominences, offering a thrilling viewing experience.

The etalon filter effectively extracts Hα light, passing wavelengths with a FWHM of less than 0.5Å. It works seamlessly with a 20mm blocking filter integrated into the solar diagonal, ensuring a safe and high-quality observation of the sun’s surface activity.

Convenience is at the core of the Heliostar 100Hα. Positioned at the telescope's center is a feature that adjusts the transmitted wavelength, allowing users to easily fine-tune contrast without the need for an expensive double-stack system. This design enhances both performance and cost-effectiveness, making it a practical choice for serious solar observers.

Versatile Eyepiece Options

This model accommodates both 31.7mm (American size) eyepieces and includes an adapter to convert to 50.8mm eyepieces. The included 22mm wide-field eyepiece with a 70° apparent field of view ensures that every observation is engaging and immersive.

The focuser employs a rack and pinion mechanism, providing stability and rigidity thanks to a guide rail on the draw tube. This setup also includes a gear reduction feature that allows for precise focusing adjustments, making it easy to achieve the perfect view of solar phenomena.

Safety and Portability Considerations

Included with the telescope is a solar guide that eliminates the need to look directly at the sun during setup, adding a layer of safety for observers. Additionally, a light shield attaches easily to the telescope, preventing direct sunlight from interfering with eye observations, enhancing user comfort.

The Heliostar 100Hα also comes with a tube band and a narrowly designed 45mm dovetail bar, enabling compatibility with a wide range of mounts available on the market. For ease of transport, a convenient carrying case is part of the package.

Specifications Overview

• - Aperture: 100mm
• - Focal Length: 800mm
• - Objective Lens Type: Acromat
• - FWHM: < 0.5Å
• - Blocking Filter Diameter: 20mm
• - Telescope Length: approximately 700mm (excluding solar diagonal)
• - Weight: approximately 6kg (including solar diagonal and eyepiece)
• - Included Accessories: Solar diagonal (with blocking filter), solar guide, 22mm eyepiece, tube band, 45mm narrow dovetail bar, light shield, and carrying case.

Launch Information

• - Product Name: Heliostar 100Hα
• - Suggested Retail Price: ¥981,750 (including tax) / ¥892,500 (excluding tax)
• - Release Date: November 29, 2025
• - Pre-Order Start Date: November 25, 2025, at 11 AM

For those eager to explore the wonders of our sun, the Heliostar 100Hα offers a remarkable opportunity to engage deeply with solar astrophysics while ensuring a user-friendly experience. Be sure to visit our product page or contact Sightron Japan for inquiries. This exceptional telescope will only be available through specialized astronomy retailers and Sightron's official stores.