Sky-Watcher 0.77x Reducer/Flattener for Esprit 150

• Sky-Watcher 0.77x Reducer/Flattener
• Only for the Esprit 150 Focuser
• Compatible with both APS-C and full frame sensors
• 36 mm fully illuminated field is available
• Also good to use for full frame cameras
• Provides a 90 mm back focus
• Or, 55 mm when back focus spacer and M48 ring installed
• Lowers f/ratio from native f/7 (1050 mm) to f/5.4 (810 mm)
• Reduces exposure time by 68% compared to native f/7
• 2.54 x 1.7 degree field of view when used with a full frame camera
• 1.66 x 1.11 degree field of view when used with APS-C crop sensor
• Includes metal thread-on caps and back focus spacer

This is the Sky-Watcher 0.77x Reducer/Flattener for their Esprit 150 ED Triplet Refractor telescope. Use this Reducer and Flattener attachment with the Esprit 150 optics to lower the f/ratio from native f/7 (1050 mm) to f/5.4 (810 mm). It also reduces your imaging exposure time by 68% compared to native f/7, by providing a brighter image.

This Sky-Watcher 0.77x Reducer/Flattener for Esprit 150 provides a nominal 90 mm or a 55 mm back focal distance which is compatible with many imaging cameras. Install the included spacer to change the back focus from the 90 mm down to the 55 mm. It also includes a convenient M48 thread adapter to mount this reducer to the Esprit 150's focuser. This Reducer/Flattener from Sky-Watcher also includes a built-in 2" filter cell to allow the installation of 2" filters.

Specifications: