Skywatcher 0.77x Focal Reducer and Flattener for Esprit 150 ED
Skywatcher 0.77x Focal Reducer and Flattener for Esprit 150 ED
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 55 mm 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 75 mm back focus is available for self-made adaptor solutions.
The reducer/flattener produces a fully illuminated and corrected image circle of 34 mm diameter and is therefore perfectly suitable for image formats up to APS-C, but can also be used for full frame format.
Type: | Focal Reducer / Field Flattener |
Reduction factor: | 0.77x |
Focal ratio on Esprit 150 ED: | f/5.4 |
Fully illuminated and corrected field: | 34 mm circle |
Usable up to: | Full frame format |
Optical design: | Three-element |
Coating: | Fully multicoated |
Connection: | Esprit 1250ED / M48 |
Working distance from M48 thread and with extension: | 55 mm (for M48 rings from Skywatcher) |
Working distance from M48 thread and without extension: | 75 mm |
Working distance from M78 male thread: | 80 mm |
Working distance from M68 female thread (adapter M78i-M68i): | 75 mm |
M48 female thread for 2" filter: | In rear M48 adapter |
Intermediate thread for self-made adaptations: | M71x1 female |
Back focus with intermediate thread: | 75 mm |
Material: | Aluminum housing |
Weight: | 910 g (with end caps) |
In the box:
♦ Esprit 150ED Focal Reducer / Flattener
♦ 2 screwable dust covers
♦ Adapter to M48 thread