ZWO FF80 APO 0.76× Full-Frame Reducer

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

Key benefits
✓ Faster shots
Shorten the focal length by 24% for shorter exposures and wider field.
✓ Flat field of view
Three-element optics with ED glass prevents star distortion at the edge.
✓ Easy mounting
Directly on M68 lens of FF80 APO, with standard steps: segment connector loose, reducer on M68, reducer in focuser.
✓ Integral filter thread
Built-in 2″ filter thread (M48×0.75) for filters without additional adapters.
✓ Universal camera connector
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 full-frame. Use the filter thread to easily mount LRGB or narrowband filters, while the ED correction ensures sharp, high-contrast images.

Technical specifications

• Telescope connection: M68
• Camera connectors: 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