Description Sky-Watcher EvoStar 80ED APO Refractor: Portable Optical Powerhouse Due to their unobstructed textbook-like diffraction patterns and exotic optical properties, the ED-APO produces the sharpest, highest quality imaging obtainable from any telescope optical design.  These breathtakingly pristine celestial views are coveted by experienced amateur astronomers. Observing with SW EvoStar 80ED 80 mm Refractor Fortunate indeed is the amateur astronomer with a SW ED-APO 80 mm refractor on a clear night with transparent skies and a stable atmosphere.  The Sky-Watcher ED-APO 80mm is a modestly wide-field telescope offering bright, wide swaths of sky in a single view.  It is well suited for wide-field astronomical observation of prominent nebulae, star clusters and galaxies from a dark-sky location, or can be used as an astrograph for sky photography.  As a terrestrial spotting scope or telephoto lens, the ED-APO’s performance is absolutely superb.  Ultra high contrast allows the subtlest of details to be easily scrutinized under conditions of good seeing.  The petite silhouette of the SW ED-APO 80 mm makes for an excellent compact, portable telescope that travels light and fits a small space.  At about 50-power, structural detail becomes apparent in our solar system’s gas giants like Saturn and Jupiter.  The Moon also exhibits striking crater detail along the lunar terminator. As an astrograph, the SW EvoStar 80ED delivers superb performance imaging a wide spectrum of astronomical phenomenon. Refractors—the Ultimate Imaging Instruments In a given aperture size, refractors will always exhibit sharper images than other optical designs because the refractor concentrates more light into the central airy-disk and first diffraction rings.  There is no diffraction pattern interference caused by a diagonal mirror, or secondary mirror being suspended in the optical path (central obstruction) as is the case with reflectors. Sky-Watcher ED-APOs—the Ultimate Refractors Sky-Watcher ED-APO refractors provide the finest images obtainable—bar none—in their design class.  If you are on a quest for the ultimate in pristine, near textbook-perfect astronomical imaging, look no further Sky-Watcher ED apochromatic refractors deliver dramatic coal-black skies and faithful, contrast-rich views of planetary and deep-space phenomenon that are second to none.  Sky-Watcher ED-APO refractors are the logical choice as an investment in advanced instrumentation for exceptional viewing or photography. Virtually Eliminates Residual Chromatic Aberration  The Sky-Watcher ED-APO design assures virtual elimination of residual “false color” (i.e. chromatic aberration) normally present in 2-element achromatic lens designs which utilize standard crown and flint glasses. Sky-Watcher APO refractors utilize the finest extra-low dispersion (ED) glass available, FPL-53.  This results in the best color correction for an ED doublet lens. Schott Glass Used for Front Crown Element and ED 2 Lens Element The P80ED will benefit from the inclusion of Schott glass being used for the positive front Crown element in the objective.