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Discover the SJH-75UF: A New Era in Refracting Telescopes

Sightron Japan, based in Shinjuku, Tokyo, is set to unveil their flagship refracting telescope, the SJH-75UF, on February 13, 2026. This innovative telescope showcases a new design that incorporates SD and ED lenses, dramatically minimizing optical aberrations and enhancing performance.

Unique Features of the SJH-75UF

The SJH-75UF utilizes an advanced Ultra Flat Field design with a lens configuration of 6 groups and 6 elements, including two SD glass elements and one ED glass element. This meticulous design delivers superior image quality and high resolution, showcasing stars with pinpoint accuracy across the entire field of view.

Exceptional Imaging Performance

With a 75mm aperture and a focal length of 375mm, this telescope accommodates a wide range of celestial targets, from prominent nebulae to smaller celestial objects. Its design enables stellar performance, providing a spot diameter of 0.67μm at the center and 1.31μm at the periphery. Such precision is far below the diffraction limit and ensures that users can capture perfect star images, enhancing astrophotography opportunities.

This advanced imaging system is not just about size but about clarity. The guaranteed image sharpness across the full image circle makes it ideal for full-frame cameras, expanding the creative possibilities for capturing the wonders of the universe.

Tailored for Astrophotography

The specifications—an aperture ratio of 1:5—ensure a bright optical path. This characteristic minimizes compatibility issues with various atmospheric filters and provides ease of use. The fully coated ULR lens minimizes reflection loss, significantly improving brightness while reducing flaring and ghosting effects.

Other notable features include an imaging circle compatible with full-frame sensors (φ44mm) and a design that sustains a minimum light fall-off of approximately 90% at the image circle's edge. This meticulous consideration effectively avoids the common problem of star splitting due to aperture restrictions.

Built for Quality and Longevity

Proudly manufactured at Sightron Japan’s facility in Tainai, Niigata Prefecture, each SJH-75UF telescope is crafted with care by experienced technicians who have honed their skills over years in the optical manufacturing industry. The production process adheres to stringent quality standards, ensuring that only the finest telescopes leave the factory.

In addition to quality assembly, Sightron Japan offers a reassuring 5-year warranty on the SJH-75UF. This guarantee covers any natural breakdown that occurs within the warranty period, giving customers peace of mind as they explore the night sky.

Enhanced Usability and Comfort

The SJH-75UF is designed with various features to streamline the observing experience. Its dual-speed rack-and-pinion focuser ensures precise focusing, accommodating heavy cameras without affecting performance. The design includes attachment points for third-party electric focusers.

The expansion of the telescope includes a retractable shade, which simplifies storage and deployment. Moreover, the 360° rotation mechanism permits easy adjustment of camera composition while avoiding interference with off-axis guiders and filter wheels.

Specifications Summary

• - Aperture: 75mm
• - Focal Length: 375mm
• - Aperture Ratio: F5
• - Configuration: 6 groups, 6 elements
• - Weight: ~4.3kg

Available from Specialized Retailers

The SJH-75UF will retail at ¥698,500 (including tax) and will be available through specialized telescope retailers affiliated with Sightron Japan. For inquiries about the product, customers can contact the Sightron Japan Support Center at 03-6908-3116.

In conclusion, the SJH-75UF represents a significant advancement in telescope technology, merging quality craftsmanship with high-performance capabilities, making it a must-have for any serious astronomer or astrophotography enthusiast.