Airy Disk Flattener / Reducer 0.75x for the 106mm APO

This 3-element 0.75x flat-field adapter is specifically made for the Airy Disk 106mm APO. It is designed to sharpen stars toward the edge of the field while reducing the system to 525mm at approximately f/4.95.

The adapter screws onto the M63x1 thread and provides 55mm to 60mm adjustable back distance from the M48x0.75 camera-side thread.

Specifications

• Magnification: 0.75x
• Connecting thread: M63x1
• Camera thread: M48x0.75
• Image circle: 44.4mm
• Minimum back focus: 55mm
• Maximum back focus: 71.15mm
• Weight: 0.79kg

Designed for serious astrophotography workflows, the Airy Disk Flattener / Reducer 0.75x for the 106mm APO helps refine field correction, back focus, and imaging performance for compatible Airy Disk refractors. It is a practical upgrade for imagers who want sharper stars, cleaner edge performance, and a more complete telescope imaging system.