ZWO FF80 APO 0.76× Full-Frame Reducer

ZWO FF80 APO 0.76× Full-Frame Reducer reduces the focal length of your FF80 APO from 600mm to 456mm (f/5.7) and provides a flat field for full-frame cameras. The three-element design, including one ED glass element, corrects field curvature and features a built-in 2″ filter thread (M48×0.75) for narrowband or color filters.

Key benefits
✓ Faster imaging
Reduces focal length by 24% for shorter exposures and wider field.
✓ Flat field
Three-element optics with ED glass prevents star distortion at the edges.
✓ Easy mounting
Direct attachment to FF80 APO’s M68 flange, with standard steps: remove segment connector, mount reducer to M68, insert reducer into focuser.
✓ Integrated filter thread
Built-in 2″ filter thread (M48×0.75) for filters without additional adapters.
✓ Universal camera connection
Output threads M48×0.75 and M54×0.75 fit all common filter wheels and camera adapters.

Practical application
Place the reducer between your FF80 APO and focuser to quickly capture larger nebulae and star fields in full-frame. The filter thread allows easy mounting of LRGB or narrowband filters, while ED correction ensures sharp, high-contrast images.

Technical specifications

• Telescope connection: M68
• Camera connections: M48×0.75 M54×0.75
• Focal reduction: 0.76× (600 → 456 mm)
• Corrected field of view: 36 mm
• Back focus: 55 mm
• Filter thread: 2″ (M48×0.75)
• Optics: three elements, including ED glass
• Material: CNC-machined aluminum
• Application: visual photographic