Skywatcher 0.85x focal reducer and field flattener for 100/900mm ED refractor

Increases field and photographic speed and corrects for field curvature

Skywatcher Field Flattener for ED refractors

The Skywatcher 0.85x focal reducer / field flattener has been designed for astronomers who want to use the renown ED Apo for astro photography. The flattener reduces the telescope's focal length by the factor of 0.85 and increases the useful field. As a positive side effect, the necessary integration times are significantly reduced. The field curvature that is unavoidable at most telescope systems is reduced to a nearly irrelevant level when using sensors up to APS-C format (24x16mm).
The optimal distance M48 - focal plane is 55mm.

The Reducers & Flatteners advantages

• Optimized for this particular refractor guaranteeing optimal results
• Better field illumination by M48 system - less vignetting compared with T2 systems.
• No expensive additional adapters necessary

Delivery contents

• Reducer / Flattener