Evostar 100mm Doublet APO Refractor (S11120) Sky-Watcher USA

SW Evostar 100ED APO Refractor: When You Demand the Best!

Sky-Watcher is a leader in the design and manufacturer of ED-APO systems.  Sky-Watcher offers one of the most extensive lines of ED-APOCHROMATIC refractors in the world.  Using only the finest fabrication materials available, Sky-Watcher Evostar APO refractors are manufactured to painstakingly rigorous, exacting standards of optical and mechanical quality to insure the amateur astronomer peak performance and a great experience each and every time a Sky-Watcher ED-APO is taken into the field.  We know the amateur astronomer has very high expectations regarding astronomical equipment purchases.  Sky-Watcher has been delivering consistent satisfaction for decades.  This telescope is designed for a lifetime of astronomical enjoyment!

Observing with the Sky-Watcher Evostar APO 100mm Refractor

Turning the telescope to the first quarter Moon, the Apennine Mountains snap into focus revealing a cornucopia of jagged mountain ridges, canyons, and numerous small craters in razor-sharp detail.  Not far removed, reaching skyward the crater wall of Archimedes pops into view in bold relief against the smooth flatlands that transverse the distance between it and the Apennine Mountains.  This is lunar observing at its best – HD style.  The gas giant Jupiter displays its swirling equatorial bands in high-definition with festoons, and tonality within the bands.  The great spot is clearly visible, discreetly contrasted from the surrounding Jovian landscape.  Saturn’s storied surface phenomenon is simply stunning.  Hunt down double stars like Epsilon Lyrae, the “double-double” in Lyra.  A 100mm refractor will provide a crisp well defined image superior to even a larger reflector.  Always a star-party favorite, Alberio located in the tail of Cygnus never fails to please as it is a beautiful double.  Alberio appears like a gold sparkler and its companion looks blue-green.  It is a perfect refractor object.  Compact globular star clusters lend themselves well to a refractor. Located outside our galaxy the globular M2 will probably resolve more stars in a 4″ refractor than a 6″ reflector.  M4, M10 and many other globular cluster can be seen well with a 100mm refractor.  M13, the fantastic globular in Hercules is a stunning sight in a 100mm refractor.  The bright central cores of prominent nebulae can be seen and the brightest stars can be resolved.  This is just the beginning of an incredible journey of exploration possible with a SW Evostar ED-APO 100mm refractor.

As an astrograph, the SW Evostar 100ED APO performs superbly delivering crisp, high-fidelity imaging of planetary, lunar and aperture appropriate deep-space 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 Evostar ED-APOs—the Ultimate Refractors
Sky-Watcher Evostar 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 Evostar 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 Evostar 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 Evostar 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 Evostar 80ED will benefit from the inclusion of Schott glass being used for the positive front Crown element in the objective.  Schott is the recognized world leader in glass utilized for precision optical lens systems, including medical instrumentation and famous-brand camera lenses.  While Schott glass is only used in selected models, all other models utilize top-quality, Grade-A glass from perhaps less famous but, nonetheless, highly respected, high-quality glass manufacturers.

Pride and Perfection in Optical Manufacturing
Every lens element is individually inspected for purity and absence of striae and other image-degrading imperfections.  Every lens is pitched polished to exacting standards of optical fabrication and performance by highly skilled opticians utilizing state-of-the-art methodology and rigidly controlled optical testing procedures.  The result is high-quality, diffraction-limited optics performing to the theoretical limits of their respective aperture sizes.  All lenses are uniformly air-spaced in their cell housings.

Sky-Watcher offers one of the most extensive lines of ED-APOCHROMATIC refractors in the world.  Using only the finest fabrication materials available, Sky-Watcher Evostar APO refractors are manufactured to painstakingly rigorous, exacting standards of optical and mechanical quality to insure the amateur astronomer peak performance and a great experience each and every time a Sky-Watcher Evostar ED-APO is taken into the field.  We know the amateur astronomer has very high expectations regarding astronomical equipment purchases.  Sky-Watcher has been delivering consistent satisfaction for over a decade.

Metallic High-Transmission Lens Coatings 
Each air-to-glass lens surface has exotic anti-reflection metallic coatings applied to ensure optimum light through-put.  The proprietary Sky-Watcher “Metallic High-Transmission Coatings” (MHC) are the finest photon anti-rejection coatings in their class.

Light-Baffled Optical Systems
The objective lens cell is light-baffled to reject stray, unfocused light.  The draw tube is likewise baffled to insure optimum contrast.  The tube interior is flat blackened to help prevent unfocused internal light reflections from reaching the focal plane.

Precision 2″ Crayford-style Focuser is Standard
Optical focus is achieved by means of a mechanically ultra-smooth, backlash-free, precision 2″ Crayford-style focuser-assembly with 1.25″ adaptor.  Focuser offers 2 speeds for fine and ultra-fine focusing adjustments.