Sky-Watcher 0.77x Reducer/Flattener for Esprit 120ED f/7 Refractor

SKU: SKWS20209 MFR: S20209
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Key Features

  • Optimize your astrophotography with this Sky-Watcher reducer/flattener for sharper images.
  • Achieve a faster f/5.4 focal ratio, perfect for capturing stunning deep-sky astrophotography.
  • The 0.77x reducer enhances your Esprit 120ED refractor's field of view for wider shots.
  • Enjoy a 3.18 x 2.12-degree field of view with a full-frame camera for expansive views.
  • Designed with a three-element lens for superior image quality and minimal distortion.
  • Features a 55mm back focus with M48 thread, ensuring easy camera attachment for astrophotography.
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Sky-Watcher Reducer/Flattener Specifications

  • Color

    Black

  • Material

    Aluminum

  • Compatibility

    Esprit 120ED f/7 Refractor

  • Additional Features

    Three-element Design, 55mm Back Focus with M48 Thread

  • Focal Ratio

    f/5.4

  • Optical Coating

    Fully Multi-Coated

  • Back focus

    95mm

  • Field of view

    3.18 x 2.12-degree (when used with a full frame camera)
    2.08 x 1.39-degree (when used with APS-C crop sensor)

  • Weight

    32.4 oz (920g)

About Sky-Watcher Reducer/Flattener

This 0.77x Reducer/Flattener is designed for the Esprit 120ED triplet APO refractor. It decreases the f/ratio from the optical tube's native f/7 to f/5.4 and reduces exposure time by 68% compared to native f/7 with the same results. Features 34mm fully illuminated field but can handle full frame as well, 95mm back-focus or 55mm using the included back focus spacer and M48 ring.

Sky-Watcher Reducer/Flattener Features

  • 34mm fully illuminated field but can handle full frame as well
  • 95mm back-focus (55mm when back focus spacer and M48 ring installed)
  • Drops f/ratio from native f/7 (840mm) to f/5.4 (647mm)
  • Reduces exposure time by 68% compared to native f/7
  • Built-in 2" filter cell for mounting filters
  • 3.18 x 2.12-degree field of view when used with a full frame camera
  • 2.08 x 1.39-degree field of view when used with APS-C crop sensor

Key Features

  • Optimize your astrophotography with this Sky-Watcher reducer/flattener for sharper images.
  • Achieve a faster f/5.4 focal ratio, perfect for capturing stunning deep-sky astrophotography.
  • The 0.77x reducer enhances your Esprit 120ED refractor's field of view for wider shots.
  • Enjoy a 3.18 x 2.12-degree field of view with a full-frame camera for expansive views.
  • Designed with a three-element lens for superior image quality and minimal distortion.
  • Features a 55mm back focus with M48 thread, ensuring easy camera attachment for astrophotography.

What's in the box:

  • Sky-Watcher 0.77x Reducer/Flattener
  • Back Focus Spacer
  • M48 Thread Adapter
  • 2x Threaded Cap
  • Sky-Watcher 2 Year Limited Warranty