Launch of the Askar 'SQA130' Astrograph: 130mm Aperture, 5-Element/5-Group (2 SD Glass) Ultra-High Resolution Petzval Design

Syumtron Japan Inc. (Headquarters: Shinjuku, Tokyo; CEO: Akira Watanabe) will release the "SQA130," a large-aperture astrograph from the Jiaxing Ruixing Optical Instrument brand "Askar," known for its exceptional optical performance and beautiful star images, on March 27, 2026.

■ Product Features

Uncompromising Optical Performance: 5-Element/5-Group Air-Spaced Petzval Design

• The "SQA130" is a new-generation astrograph featuring a 130mm objective lens aperture and a 624mm focal length (f/4.8 focal ratio).
• It utilizes a 5-element in 5-group lens configuration, incorporating two SD (Special Low Dispersion) glass elements. This design corrects aberrations to the limit, delivering sharp, high-contrast images across the entire field of view.
• The Petzval structure allows for a flat image plane without additional accessories. With all lenses fixed in place, users can achieve focus within a range of 46mm to 76mm (recommended 55mm) without worrying about complex back-focus calculations.

Image Circle Covering Medium Format with Ultimate Star Quality

• The image circle supports medium format (φ55mm), not only covering the vast area of a full-frame sensor (φ44mm) but also ensuring abundant peripheral illumination. Peripheral illumination reaches approximately 85% at the edge of the medium format and 95% at the edge of the full-frame.
• It achieves stunning star images with an RMS spot radius of less than 2μm at the center and less than 2.4μm at the edge of a full-frame sensor. This minimizes vignetting and star distortion, significantly reducing the burden of image processing.

Robust and Lightweight Mechanical Design for Astrophotographers

• The tube rings are CNC-machined from aircraft-grade aluminum with a hollowed-out design, achieving high rigidity while reducing the overall system weight. Large thumb screws allow for opening, closing, and sliding the tube without tools, even while wearing gloves in cold climates.
• The tube rings feature a total of six M4/M6 screw holes on the sides, providing flexibility for mounting various accessories such as controllers.
• A 300mm-long wide dovetail plate is included as standard at the bottom of the tube.