BK 1206EQ3

BK 1206EQ3

This Sky-Watcher 120mm (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 EQ3 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 80mm 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 3kg. (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, 510mm 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 T-adapter (readily available through camera shops for a specific SLR) and the optional 60mm (2.5") extension tube gives closer focussing for terrestrial photography.

It comes with the heavy-duty EQ3 mount features 360 degree worm-gear tracking controls on both axes, large knob-style R.A. and Dec. lock bolts, dual metal setting circle dials, a latitude adjustment screw, and a built-in polar scope holder. It can be fitted with both single and double axis motor drive for auto-tracking. EQ3 is supported on Heay Duty Pre-assembled Aluminum tripod for convenient and quick assembly with large wall-to-wall accessory tray.

  • Diameter/Aperture: 120mm
  • Focal Length: 600mm
  • F/ratio: F/5
  • Highest Practical Power (Potential): 240x
  • Multi-coated Achromatic objective lens
  • Aluminum tube
  • Eyepiece Supplied (1.25"): 10mm & 25mm
  • Eyepiece Supplied (1.25”) Achromat Barlow 2X with camera adapter
  • Magnification (with eyepieces supplied): x60, x120, x24, x48
  • Diagonal Supplied 1.25”
  • Red Dot Finder Scope with bracket
  • Smooth rack-and-pinion 1.25" focuser
  • German Equatorial Mount EQ3
  • Heavy Duty Aluminum Tripod with accessory tray
  • Pre-assembled tripod for convenient and quick assembly
  • Counter Weight with steel shaft
  • RA & DEC slow motion manual control cables
  • Tube rings with gang plate
  • Tripod Height: 67-119cm
  • Tripod Weight: 3.7Kg
  • Good resolution of the Moon, Planets, Galaxies and Nebula
  • Nature Observation

Recommend for: Beginners & Advanced

Optical Design

Achromatic Refractor

Diameter / Aperture

120 mm

Focal Length

600 mm

Highest Practical Power


Faintest Stellar Magnitude




Focuser Diameter


1.25" Eyepiece




Finder Scope

Red Dot

Tube Weight


Shipping Weight


Shipping Dimensions

102x42x24 cm3