Sky-Watcher 0.77x Reducer/Flattener for Esprit 150

M48 thread

Designed specifically for the Sky-Watcher Esprit-150 ED Apo Refractor, the new three-lens Focal Reducer/Flattener has a reduction factor of 0.77x. It comes with a standard adaptor with M48 thread edge and 55mm back focus for use with Sky-Watcher's M48 Canon EOS (code 20237) and Nikon (code 20238) adaptor rings. After removing the adaptor, an M71x1 internal thread with maximum 75mm back focus is available for self-made adaptor solutions. The Reducer/Flattener produces a fully illuminated and corrected image circle of 34mm diameter and is therefore perfectly suitable for image formats up to APS-C but can also be used for full format.

• 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