EvoStar 120ED - SKU# S11130
- 120 mm apochromatic Refractor with Schott BK-7 and FPL-53 ED glass
- 900 mm focal length (f/7.5)
- 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
SKY-WATCHER EvoStar 120ED APO REFRACTOR
Sky-Watcher high-performance ED-APO refractors offer premium optical performance for the discriminating amateur astronomer. SW APO refractors utilize the most modern optical glasses and fabricating techniques to deliver the ultimate in high-fidelity astronomical imaging.
Observing with the Sky-Watcher EvoStar 120ED APO Refractor
The additional aperture compared to a 100 mm diameter lens provides a dramatic increase in resolution and a heighten sense of seeing lunar and planetary surface phenomenon in seemingly 3D high-definition.
As an astrograph, the SW EvoStar 120ED 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.
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.
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)||120.5|
|Primary Aperture (mm)||120|
|Focal Length (mm)||900|
|Light Gathering (compared to next size down)||44%|
|Focuser||2" Dual Speed Crayford|
|OTA Length (Retract/Ext.)||36"|
|OTA Outer Diameter||5.625"|
|OTA Weight (with accessories)||13.9|
|Included Finder||8x50 RACI|
|Included Diagonal||2" Dielectric|
|Included Eyepieces||25mm LET/5 Planetary|
|Magnification w/ Included Eyepieces||45x/180x|