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For perfect illumination
you can also bring distant objects close up
The optics render a clear image
it also allows to distinguish some structures in Venus' atmosphere
William Optics Adjustable Flattener Reducer Flat61R for ZenithStar 61 For perfect illuminationDescription The flattener is a lens that evens out the field, as this is slightly curved by the primary optics. This curvature causes stars that are imaged at the edge of the field of view to be less sharp. The flattener, also called a field flattener, corrects this effect. Astrophotographers can then enjoy images where the stars remain sharp right out to the edge of the exposure. The flattener is installed between the telescope and the camera. This
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