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