Sky Watcher Sky-Watcher 100ED PRO Refractor OTA Black Diamond

Sky Watcher Sky-Watcher 100ED PRO Refractor OTA Black Diamond Product Description

Sky Watcher 100ED PRO Refractor OTA Black Diamond Product Info

Sky Watcher is a leader in the design and manufacturer of ED APO systems. Sky Watcher offers 1 of the most extensive lines of ED APOCHROMATIC refractors in the world. Using only the finest fabrication materials available, Sky Watcher 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 PRO ED 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 39 s storied surface phenomenon is simply stunning. 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 ED APO 100mm refractor.

As an astrograph, the SW PRO 120ED APO performs superbly delivering crisp, high fidelity imaging of planetary, lunar and aperture appropriate deep space phenomenon.

Refractors 39 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 39 the Ultimate Refractors

Sky Watcher ED APO refractors provide the finest images obtainable 39 bar none 39 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 back 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 secondary, residual false color normally present in 2 element achromatic lens designs using Crown and Flint glass. Sky Watcher APO refractors utilize a second lens element made from the mineral fluorite instead of Flint glass. Fluorite, CaF2, is a halide with unique properties and a hardness of only 4. It is an exotic and difficult material to fabricate into a lens. Hence the cost of manufacturing a fluorite lens is quite high compared to a Flint lens element, for instance.
Why fluorite Fluorite 39 s molecular properties have several distinct advantages. First, it has superior dispersion characteristics compared to pure silica based glass. It functions as a high index lens with very low dispersion. We use the term ED to signify Extra low Dispersion . Fluorite also corrects well for spherical aberration. Sky Watcher utilizes only the very finest available fluorite lens, FPL 53.

Schott Glass Used in Selected Models for Crown Element

Select models of ED APO refractors 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.

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 rack pinion focuser assembly with 1.25 adaptor. This focuser operates at 2 speeds for fine and ultra fine focusing adjustments.

Tube Materials

The optical tube material is aluminum, powder coated reflective gloss black with gold fleck accent. The front and back cells are cast aluminum painted white, or black.

Telescope Tube Attachment Hardware

The Sky Watcher APO optical tubes come with attachment hardware that allows them to be securely fastened to the SW EQ5P mount. The quick release tube rings provided with SW ED APO models 80ED 100ED and 120ED are cast aluminum, painted white

Specifications
Shipping Weight	27.00 lbs
Optical Design	ED Refractor
Aperture Diameter	100mm
Focal Length	900mm
F Ratio	F/9
Highest Practical Power	200x
Faintest Stellar Magnitude	12.7
Resolving Power	1.15
Finderscope	9x50
Focuser Diameter	2
Diagonal	90 39 Star Diagonal
Eyepiece s	1.25 LET 20 and 5
Piggyback Bracket	YES
Tube Weight	3 kg
Tube Dimension dia. x length	10 cm x 92cm

Package Contents

• Sky Watcher 100ED PRO Refractor OTA Black Diamond
• 1.25 LET 20 and 5
• Package Contents may vary