Description
- The SJH-75UF is an astrograph featuring a 75 mm aperture and a 6-element, 6-group optical design incorporating SD and ED lenses, engineered with an ultra-flat field design that minimizes aberrations to the utmost limit.
- Designed by a veteran optical engineer who was involved in the development of renowned classic telescopes in Japan, this completely new design represents Sightron Japan’s flagship astronomical telescope, pushing the limits of telescope design.
- This telescope has been meticulously engineered to achieve the fundamental goal of rendering stars as sharp points across the entire field of view, delivering exceptionally high resolution. The spot diagram diameter is approximately 0.67 μm at the center and 1.31 μm even at the extreme edge of a full-frame sensor – values well below the diffraction-limited Airy disk. By providing uniform point images across the entire full-frame sensor, it greatly enhances both the creative flexibility and the overall quality of astrophotography.
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Use of Special Low-Reflection Anodizing
Special low-reflection anodizing is applied to parts such as lens spacers and certain light-shielding components.
This treatment effectively suppresses reflections from visible light to near-infrared wavelengths, while also offering excellent durability and maintaining stable performance over a long period of time.
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Reliable Made-in-Japan Quality
The SJH-75UF optical tube is assembled and inspected at our in-house factory in Tainai City, Niigata Prefecture.
Each unit is carefully finished by skilled craftsmen, and only products that meet strict quality standards are shipped.
Specifications
- Aperture : 75mm
- F-ratio : F5
- 6 Elements Optical system (2 x SDs + 1 x ED)
- Image Circle : Φ44mm
- Back Focus Distance : 105.4mm from the camera rotator
- OTA Weight (without a plate and rings) : 4.3kg
- Physical Length : 376mm
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