EvoStar 120ED - SKU# S11130

by Sky-Watcher
$2,050.00
  • 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.


Specifications

SKU S11130
UPC 050234111300
Optical Info
Optical Design ED Doublet
Lens Coatings Fully Multi-Coated
Glass Type BK7/FPL-53(ED)
True Aperture (mm) 120.5
Primary Aperture (mm) 120
F/Ratio 7.5
Focal Length (mm) 900
Observational Info
Dawes Limit 0.97
Rayleigh Limit 1.16
Limiting Mag. 12.9
Minimum Magnification 17
Maximum Magnification 236
Light Gathering (compared to next size down) 44%
General Info
Focuser 2" Dual Speed Crayford
OTA Length (Retract/Ext.) 36"
OTA Outer Diameter 5.625"
OTA Weight (with accessories) 13.9
Accessories
Included Finder 8x50 RACI
Included Diagonal 2" Dielectric
Mounting Accessories Rings/V-Rail
Included Eyepieces 25mm LET/5 Planetary
Magnification w/ Included Eyepieces 45x/180x
Included Case Yes
Corrector No (optional)

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