This precision-machined adapter allows the 3" Field Flattener / 0.7x Focal Reducer (FFFR507X-00) to be used with standard 2" focusers. Machined from a single piece of aluminum for concentricity and alignment integrity — critical for optical accessories where any tilt introduces aberrations.

Threaded to accept standard 2" astronomy filters between the corrector and the focuser.

Key Features

• Single-piece aluminum construction for precise alignment
• Threaded for 2" astronomy filters
• Connects the FFFR507X-00 to any standard 2" focuser draw tube

Compatibility

• Required for: Using the FFFR507X-00 on telescopes with 2" focusers
• Not needed if: Your telescope has a native 3" focuser connection
• For 2.5" hex focusers: A different adapter is required (Item #510366)