Reducer / Corrector 0,85x Skywatcher for 120ED

This accessory is necessary because refractors (binoculars) provide a curved focal plane, stars are not punctual near the edges. The reducer/corrector provides a corrected image up to the edge of the field.

It screws directly onto the crayford of the telescope (M56 threading). Optimized for Sky-Watcher 120ED f/7.5 Black Diamond (Doublet) telescopes, this screw-in reducer/corrector reduces the focal length of the telescope by a factor of 0.85x (induced focal ratio of f/6.375).

Characteristics

• Threading: Female M56 at the front, male M48 at the back
• Backfocus: 55mm

The use of a focal reducer in astrophotography also allows to reduce exposure time. It will be necessary to use a dedicated large field T-ring M48 for your camera.