ZWO FF65APO 0.75× Full Frame Reducer


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  • Full frame reducer for the ZWO FF65APO telescope
  • Shorter focal ratio f/4.8
  • Reduced exposure times and wider field of view

Focal reducer for the ZWO FF65APO Telescope

ZWO has released a brand-new FF65APO 0.75× full frame reducer with a four-element optical design. It has a reduction factor of 0.75x, which gives the FF65APO f/6.4 astrograph a shortened focal ratio of f/4.8 and a shorter focal length of 312mm. This allows for less total integration time and a wider field of view, bringing more convenience and possibilities for your wide-field deep sky imaging. The back focus distance is the standard 55mm. It also comes with two thread adapters of M54 and M48, and a built-in M48x0.75 2” filter thread, which makes the connection work simple and convenient.

Connection steps:

  1. Prepare the FF65APO telescope tube and the focal reducer.
  2. Unscrew the eyepiece holder at the end of the FF65APO telescope tube.
  3. Unscrew the end cap of the 0.75X reducer.
  4. Insert the reducer into the focuser and tighten.

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