EvoStar 100ED - SKU# S11120
- 100 mm apochromatic Refractor with Schott BK-7 and FPL-53 ED glass
- 900 mm focal length (f/9)
- Dual-speed 2″ Crayford-type focuser with 1.25″ adaptor
- 8×50 RA erect-image finderscope
- 2″ dielectric diagonal
- 20 mm and 5 mm 1.25″ eyepieces
- Tube-ring attachment hardware n Aluminum carry case
SW EvoStar 100ED APO Refractor: When You Demand the Best!
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 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.
Observing with the Sky-Watcher EvoStar 100ED 100mm Refractor
A 100mm refractor will provide a crisp well defined image superior to even a larger reflector. As an astrograph, the SW EvoStar 100ED APO performs superbly delivering crisp, high-fidelity imaging of planetary, lunar and aperture appropriate deep-space phenomenon.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-back skies and faithful, contrast-rich views of planetary and deep-space phenomenon that are second to none.
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.
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.
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.
|Optical Design||ED Doublet|
|Lens Coatings||Fully Multi-Coated|
|True Aperture (mm)||100|
|Primary Aperture (mm)||100|
|Focal Length (mm)||900|
|Light Gathering (compared to next size down)||56%|
|Focuser||2" Dual Speed Crayford|
|OTA Length (Retract/Ext.)||34"|
|OTA Outer Diameter||4.5625"|
|OTA Weight (with accessories)||8.4|
|Included Finder||8x50 RACI|
|Included Diagonal||2" Dielectric|
|Included Eyepieces||25mm LET/5 Planetary|
|Magnification w/ Included Eyepieces||45x/180x|