#Japan #Tokyo #Sightron Japan #Reducer 0.5× #Astronomy Equipment

Sightron Japan Unveils the Reducer 0.5× American Size

On November 7, 2025, Sightron Japan, headquartered in Shinjuku, Tokyo, will introduce its latest astronomical accessory, the Reducer 0.5× American Size. This innovative product is designed to enhance the capabilities of astronomy enthusiasts and professional photographers alike.

Product Overview

Brand: Sightron Japan
Product Name: Reducer 0.5× American Size
Retail Price: Open (Estimated market price around ¥5,000 including tax)
Release Date: November 7, 2025 (Friday)

The estimated market price is just that—an estimation—and the final retail price may vary. The Reducer aims to significantly improve the field of view for users looking to capture expansive astronomical scenes.

Key Features

The Reducer 0.5× is engineered for compatibility with CMOS cameras used in astronomy. By attaching it to the nosepiece of these cameras, photographers can gain a wider area of capture, making it especially ideal for telescopes with an F10 or greater aperture ratio. Here are some standout features:

• - Compatibility: The reducer allows for attachment to American-style filters (thread pitch: 0.6mm) and serves multiple functions, including usage with eyepieces.
• - Manufacturing: All products are crafted at Sightron Japan’s factory located in Tainai, Niigata.

Specifications

• - Lens Composition: Two-element (fully multi-coated)
• - Thread Diameter: 28.5mm
• - Thread Pitch: 0.6mm
• - Frame Thickness: 7.5mm
• - Standard Back Focus: 37.5mm

This device is primarily intended for refracting telescopes with an aperture ratio of F10 or higher. Users should be cautious that utilizing it with optical systems brighter than F10 can increase spherical aberration. Additionally, certain optical systems may not achieve infinity focus.

Adjustments in the lens's back focus will affect the magnification, and as one moves away from the reference value of 37.5mm, performance may decline.

Visual Insights

The accompanying images illustrate the effectiveness of the Reducer 0.5×. The top image showcases a CMOS camera fitted with the reducer mounted on a Maksutov-Cassegrain telescope with an 80mm aperture and 800mm focal length, showing a stunning capture of the moon. In contrast, the lower image depicts a photograph taken without the reducer, exemplifying the extended range and clarity provided by the new product.

Additional Information

The Reducer 0.5× American Size will be available exclusively through astronomy specialty shops and Sightron Japan’s directly operated stores. For inquiries, customers can reach the Sightron Japan consultation desk at 03-6908-3116.

About Sightron Japan

Founded in 1961, Sightron Japan has evolved from a specialized trading company dealing in binoculars and optical products to a manufacturer and seller of various optical instruments, including binoculars, telescopes, and filters. Furthermore, they handle sales for foreign lens brands and act as the sole distributor for leading astronomical telescope manufacturers domestically. The company is also engaged in co-hosting stargazing events and initiatives organized by companies and municipalities.

For further details, visit their official site: Sightron Japan.