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Sky-Watcher Esprit 120ED 120EDX 0.77x Reducer Flattener
399.00
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Three-lens 0.77x reducer/flattener designed for the Sky-Watcher Esprit 120ED and Esprit 120EDX. It provides a 34 mm fully illuminated and corrected image circle, 55 mm back focus with the supplied adapter and an M48 x 0.75 connection.
Designed for the Sky-Watcher Esprit 120ED and Esprit 120EDX refractors, this reducer/flattener combines a 0.77x focal reduction with field correction for astrophotography.
Its three-lens optical design provides a fully illuminated and corrected image circle measuring 34 mm in diameter. This is particularly suitable for sensors up to APS-C format, while full-frame use is also supported.
On the Esprit 120ED, the 0.77x reduction factor effectively changes the focal ratio to approximately f/5.4.
The supplied adapter features an M48 x 0.75 thread and provides 55 mm of back focus. This configuration can be used with the corresponding M48 Canon EOS and Nikon adapter rings.
After removing the supplied adapter, an internal M71 x 1 thread becomes available, providing up to 75 mm of back focus for custom adapter solutions.
The reducer/flattener is also compatible with 2-inch filters.
Three-Lens Optical Design
The optical system uses three lenses to combine focal reduction with field flattening.
The reduction factor is 0.77x.
34 mm Image Circle
The fully illuminated and corrected image circle measures 34 mm in diameter.
This coverage is particularly suitable for APS-C sensors. Full-frame use is also supported.
55 or 75 mm Back Focus
With the supplied M48 adapter installed, the required back focus is 55 mm.
After removing the adapter, the internal M71 x 1 thread provides up to 75 mm of back focus for custom adapter solutions.
M48 x 0.75 Connection
The supplied adapter features an M48 x 0.75 thread.
This connection can be used with the corresponding M48 Canon EOS and Nikon adapter rings.
2-Inch Filter Compatibility
The reducer/flattener is compatible with 2-inch astronomical filters.
Technical Specifications
• Manufacturer : Sky-Watcher
• Type : Focal reducer and field flattener
• Compatibility : Esprit 120ED and Esprit 120EDX
• Reduction factor : 0.77x
• Optical design : 3 lenses
• Effective focal ratio with Esprit 120ED : f/5.4
• Fully illuminated and corrected image circle : 34 mm
• Sensor format : Up to full frame
• Filter compatibility : 2 inch
• Back focus with supplied adapter : 55 mm
• Maximum back focus without adapter : 75 mm
• Adapter thread : M48 x 0.75
• Internal thread without adapter : M71 x 1
• Weight with end caps : 910 g
• Manufacturer product code : 20095
Package Contents
• Sky-Watcher 0.77x reducer/flattener
• M48 x 0.75 adapter
Sky-Watcher Esprit 120ED 120EDX Réducteur 0,77x
Specific References
- UPC
- 20095
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Three-lens 0.77x reducer/flattener designed for the Sky-Watcher Esprit 120ED and Esprit 120EDX. It provides a 34 mm fully illuminated and corrected image circle, 55 mm back focus with the supplied adapter and an M48 x 0.75 connection.