SKYWATCHER FLATTENER & REDUCER FOR 80ED

The SkyWatcher field flattener and reducer for the Evostar 80ED transforms your telescope into a professional astrograph.

The 0.85x reduction factor will convert the focal ratio of your Evostar 80ED from f/7.5 to f/6.375 with the advantage of shortening the exposure time and extending the field of view. The native 600mm focal length is reduced down to 510mm.

Refractors are affected by field curvature no matter what brand or diameter. This is not an issue for visual observations as eyepieces can partially compensate for these aberrations. On the contrary, when a refractor is used for astrophotography, a curved field will limit the corrected image circle and the stars on the border of the field will appear elongated.

The field flattener and reducer can be screwed directly onto the focuser of the Evostar once the final ring on the focuser tube is removed. On the camera side, the reducer has a M48 male thread that makes this reducer suitable for the majority of camera adapters and T-rings.