As a high powered stargazing tool, this 0.77 Reducer Flattener from Sky Watcher is a must have for astrophotographers utilising the Esprit 150ED Professional Super APO Triplet Refractor OTA. In short, the field flattener accurately corrects the inherent spherical aberration of curved lenses. Without such a tool, image quality is lessened as the frame appears distorted at the edges of the field of view. When used as a focal reducer, you are afforded a key reduction in the focal ratio of the scope. By doing so, you are left with a wider field of view with shortened exposure time, allowing for more images to be captured in a shorter amount of time without affecting their overall quality.
Price: £329.00 from Wex Photographic
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