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The Esprit ED APO 80mm Telescope from Sky-Watcher
is a 3-element refractor telescope designed for astrophotographers. The
optical system features apochromatic extra-low dispersion (ED) glass
and fully multicoated optics. A 2-element threaded field-flattener
corrects distortion that can occur at the edges of the field of view.
This combination makes astrophotographic images clear and sharp, with
high-contrast and true-color transmission, from one edge of the field of
view to the other. With a focal ratio of f/5, this fast telescope is
well-suited for astrophotography.
The 2" rack-and-pinion
Helinear Track focusing system allows you to bring celestial objects
into precise focus with virtually no shift. The focuser features tracks
above and below the focus tube. This gives the mechanism two points of
contact, keeping focuser level even with a camera mounted on it. The
Esprit comes with a 90° star diagonal with dielectric coatings. These
coatings provide better than 99% light reflection. The telescope also
comes with a 8x50 right-angle erector finderscope, a Cannon 48mm T-Ring
photo adapter, and a foam-lined aluminum case.