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Designed specifically for their EvoStar 72ED f/5.8 refractor guidescope, the Sky-Watcher 0.85x Focal Reducer/Flattener
is an indispensable dual-purpose accessory that allows you to use it
for astrophotography and astroimaging. The field flattener corrects the
inherent spherical aberration of curved lenses which, if left
uncorrected, causes images to appear distorted at the edges of the field
of view. As a focal reducer, it reduces the focal ratio of the scope
which translates into wider fields of view with shorter exposure
times—allowing you to capture more images in the same amount of time
without sacrificing performance.