Sky-Watcher BK 120/600 AZ3

  • Achromatic 120 mm refractor
  • air-spaced, fully multi-coated objective lens
  • AZ3 Azimuthal mount
  • Tripod height: 71-123 cm

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Product description

This Sky-Watcher 120 mm (4") f/5 telescope is a two-element, air-spaced, fully multi-coated objective, achromatic refractor, which can give exciting "rich field" astronomical views. It can provide excellent vistas of star fields, clusters, nebulae, galaxies, planets, the Moon and (with correct filtering or by projection) the Sun.

It is also a fine terrestrial telescope when mounted on an alt-azimuth mount or a photographic tripod. Crisp images at a reasonable price make it an excellent beginner's "first telescope", or a great travelling telescope for a more advanced observer. Similar to the popular 80 mm f/5 refractor, this larger aperture model has more light collecting power at the same focal ratio and accepts 2" diagonals for awesome wide field views, while only a small amount to chromatic aberration and weight. Weighing about 3 kg. (6.5lbs.) the optical tube assembly is readily carried and with a compressed length of approximately 50cm (21.7") it is easily transported.

Being a refractor, it is quick and easy to set up and the low- maintenance, enclosed optics come fully collimated from the factory. The optical tube assembly comes with "tube-mounting rings". These hinge open to allow easy installation of the optical tube and the locks can be loosened during use to allow tube rotation and balancing. Mounting the telescope on an alt-azimuth or an equatorial mount is quick and simple with the appropriate mounting plate.

This telescope also performs well as a fixed aperture, 510 mm lens for both terrestrial and astro photography. The "fast" f/5 focal ratio, combined with today's high speed films, is excellent for capturing lunar and solar eclipses as well as for nature photographs. A solid, equatorial mount and a method of guiding is required for longer exposure astrophotography. A T-mount thread on the eyepiece holder allows direct attachment of an appropriate T2-adapter and the optional extension tube gives closer focussing for terrestrial photography.

Card Code4011011021
Moon & PlanetsYes
Nebulae & galaxiesYes
Nature observationYes
Sunnot recommended (Only with appropriate Sun filter)
Recommended for-
Experienced amateursNo
Optical designAchromatic
Aperture (mm)120
Focal length (mm)600
Focal RatioF/5
Resolving Power (theoretical)0.96 arc sec
Magnitude limit (theoretical)12.3
Light gathering capacity (in relation to human eye)340
Tube weight (kg)3.97
Type of buildGear rack
Connection barrel2"
Type of buildAlt-Az
GoTo controlNo
--Included accessories---
1.25'' eyepieces25mm, 10mm
Finder scopeRed dot finder
Package weight12
Sky Guide 2016

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