Flattener + focal reducer for Sky-Watcher 80ED

Sky-Watcher 0.85× reducer and field flattener for Evostar 100ED (Sky-Watcher). The Sky-Watcher reducer and field flattener is designed for the Evostar 100ED 100/900 refractor. It shortens the focal length by a factor of 0.85× and improves correction towards the edges of the frame. Used with this telescope, it provides a nominal focal length of 765 mm and a focal ratio of approximately f/7.65.

Key features

• field correction optimised for the Sky-Watcher Evostar 100ED refractor
• shorter focal length and a wider imaging field
• camera-side thread M48 × 0.75
• required 55 mm backfocus allowing for adapters and the camera ring

Included items

• reducer and field flattener with a 0.85× factor for Sky-Watcher Evostar 100ED

Technical specifications

• type: focal reducer and field flattener
• dedicated telescope: Sky-Watcher Evostar 100ED 100/900
• reduction factor: 0.85×
• nominal system focal length: 765 mm
• nominal system focal ratio: approximately f/7.65
• backfocus: 55 mm
• camera-side thread: M48 × 0.75
• camera attachment for Canon or Nikon: via a separate M48 ring with the appropriate bayonet

Correct field correction requires the specified sensor spacing, allowing for the thickness of adapters and the camera ring.

The photos show the corresponding ED80 reducer. The version offered here is designed for the Evostar 100ED and carries the appropriate model marking.
 

 

 
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