Sky-Watcher Focal Reducer Field Flattener 0.77x for Esprit 120ED
Sky-Watcher Focal Reducer Field Flattener
for Esprit 120ED
This Sky-Watcher 0.77x focal reducer and field flattener is designed for the Esprit 120ED triplet APO refractor. Slipping into the telescope's focuser, the Esprit 120 focal reducer/field flattener boasts a number of features:
- Drops the focal ratio from the native f/7 (840 mm) to f/5.4 (647 mm)
- Back-focus: 95 mm (55 mm with spacer and M48 ring installed)
- Reduces exposure time by 65% compared to the native f/7
- Mount filters with the built-in 2" filter cell
- 34 mm fully illuminated field
- APS-C field of view: 2.08 x 1.39-degrees
- Compatible with full frame format
- Full frame field of view: 3.18 x 2.12-degrees