The SVBONY 0.5× Focal Reducer is a compact 1.25-inch accessory designed to widen the field of view for eyepiece-based astrophotography and visual observing. By reducing the effective focal length, it allows larger celestial objects to fit more comfortably within the frame and improves usability with entry-level imaging setups.

Key Features

• 0.5× Focal Reduction
  Reduces the effective focal length by approximately 50%, delivering a significantly wider field of view for both observing and basic astrophotography.
• Wider Framing for Large Objects
  Particularly useful for extended deep-sky targets such as nebulae, open clusters, and the Moon.
• Anti-Reflection Coated Optics
  Fully coated air-to-glass surfaces improve contrast and reduce internal reflections, helping maintain image clarity.
• Suitable for Visual & Eyepiece Projection Imaging
  Can be used visually to increase true field of view, or with eyepiece-projection and entry-level CCD/CMOS imaging setups.
• All-Metal Construction
  Durable metal housing with precise 28.5×0.6 threading on both ends for secure attachment.

Use Case & Performance Notes

This 0.5× reducer is best suited to small sensors, planetary cameras, and eyepiece-based imaging. The actual reduction factor may vary depending on spacing and optical configuration.

• Ideal for Moon and large deep-sky objects
• Useful for improving framing with short eyepiece projection setups
• Not designed for full-frame or large-sensor deep-sky imaging

Compatibility Notes

• 1.25-inch eyepiece and accessory systems
• Thread specification: 28.5×0.6 (standard 1.25-inch filter thread)
• Best results achieved with modest sensor sizes and careful spacing