Sky-Watcher Focal Reducer Field Flattener 0.77x for Esprit 150ED
Sky-Watcher Focal Reducer Field Flattener
for Esprit 150ED
This Sky-Watcher 0.77x focal reducer and field flattener is designed for the Esprit 150ED triplet APO refractor. Slipping into the telescope's focuser, the Esprit 150 focal reducer/field flattener boasts a number of features:
- Drops the focal ratio from the native f/7 (1050 mm) to f/5.4 (810 mm)
- Back-focus: 90 mm (55 mm with spacer and M48 ring installed)
- Reduces exposure time by 68% compared to the native f/7
- Mount filters with the built-in 2" filter cell
- 36 mm fully illuminated field
- APS-C field of view: 1.66 x 1.11-degrees
- Compatible with full frame format
- Full frame field of view: 2.54 x 1.7-degrees