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Achromatic refractor optical tube. Aperture: 120mm. Focal length: 1000mm

Refractor
Optical design
120
Aperture – the diameter of the light-collecting lens (refractors and catadioptric) or mirror (reflectors) that the telescope uses to collect light
1000
Focal length – the distance from the primary lens or mirror to the point at which the light is focused
Availability

Product ID 75157
Brand Sky-Watcher
EAN 0753215774579
Package size (LxWxH) 137x24x23 cm
Shipping Weight 14 kg
Optical design refractor
Description

Sky-Watcher Evostar 120 OTA provides powerful optics and high resolution, making it ideal for detailed planetary observing. Its 120mm aperture makes this achromatic refractor one of the larger examples of this type of amateur telescope design. The aperture ratio of f/8.3 means most chromatic aberration has been well corrected.

The telescope is a refractor and so provides a high contrast image – essential for observing the planets. The most important thing when observing planets is being able to see the individual details, such as the polar ice caps on Mars or the Great Red Spot on Jupiter. With this telescope, there is nothing standing in the way of you taking a tour through the solar system. Many deep-sky objects, such as the Ring Nebula or the distant globular cluster M13, can also be seen. With 293x more light gathering capacity than the naked eye alone, it can shows objects that cannot even be seen without optical assistance.

The telescope collects 44% more light than a 100mm telescope. It comes with a 2" focuser which includes a 1.25" reducing adapter, meaning both sizes of eyepiece may be used. A 2" eyepiece lets you achieve the widest possible field of view. So, for example, a 40mm 2" eyepiece with 72° apparent field of view lets you observe 2.8 degrees of the night sky. Consequently, extended deep sky objects will fit well into the field of view. The finder scope provided is mounted parallel to the main telescope tube and is indispensable when for first locate objects. Astrophotography can also be done with this telescope: the Moon, planets, and even the most nebulae can be photographed using it.

The OTA is also visually a real gem, and looks simply stunning. It features an elegant design for the both OTA and finder scope in an aesthetically pleasing shimmering black metallic effect.

Features:

  • Powerful refractor
  • High contrast images and reduced chromatic aberration
  • 2 inch focuser
  • Well suited to astrophotography
  • Prism rail for quick mounting of optics
  • Finder scope

The kit includes:

  • Optical tube
  • 10mm eyepiece, 1,25"
  • 25mm eyepiece, 1,25"
  • Diagonal mirror, 2"
  • 9x50 optical finderscope
  • User manual and warranty
Specifications
Product ID 75157
Brand Sky-Watcher
EAN 0753215774579
Package size (LxWxH) 137x24x23 cm
Shipping Weight 14 kg
Optical design refractor
Optical scheme achromat
Optics coating multi-coated
Objective lens diameter (aperture), mm 120
Focal length, mm 1000
Highest practical power, x 240
Aperture ratio f/8.33
Eyepieces 10mm (100x), 25mm (40x)
Eyepiece barrel diameter, in 1.25/2
Finderscope optical, 9x50
Focuser Crayford, 1.25", 2"
Additional 90 º diagonal mirror (2") ; 2"–1.25" adapter
Ability to connect additional equipment camera via adapter and bayonet ring (purchased separately)
Optical tube mounting mode fastening rings
Dovetail mount
User level beginners, experienced users
Assembly and installation difficulty level easy
Observed object planets of the Solar System, terrestrial objects
Reviews
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