Skywatcher 0.85x focal reducer and field flattener for 120/900mm ED refractor
... increases field and photographic speed and corrects for field curvature
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 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
This flattener is recommended for the following telescopes: -- Skywatcher ED 120/900 (Pro Series, Evostar ED120... ) -- Orion ED 120/900
Technische Daten: -- Threads directly to the focuser's drawtube -- M48 thread on the camera side - find adapter rings for your camera model in the "accessories" section -- Optimal distance M48 - focal plane: 55mm (will be kept automatically if using the recommended rings and a DSLR