Sky-Watcher Esprit 150ED .77x Reducer Field Flattener

The Esprit 150ED Reducer/Flattener is an optical tube accessory to allow Esprit 150 users to reduce imaging time by 68% with a wider field of view to get the most performance out of the  telescope.

Sky-Watcher Esprit 150ED .77x Reducer/Field Flattener Highlights

• 36mm fully illuminated field, compatible with both APS-C and full frame sensors
• 90mm back-focus (55mm when back focus spacer and M48 ring installed)
• Drops f/ratio from native f/7 (1050mm) to f/5.4 (810mm)
• 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 reducer, metal thread-on caps, back focus spacer and M48 thread adapter
• Built-in 2" filter cell for mounting filters into the light path