BK 804AZ3

BK 804AZ3

The Sky-Watcher 70mm (2.8") f/5 and 80mm (3.1") telescopes are two-element, air-spaced, fully multi- coated objective, refractors. The 80mm f5 is a well- proven performer which gives "rich- field" views of star fields, clusters, nebulae, bright galaxies, planets, the Moon and (with correct filtering or by projection) the Sun, as well as excellent terrestrial views. Both telescopes give images which are crisp and with very little chromatic aberration. One of the greatest assets of these solidly built telescopes is portability. The light-weight optical tubes (1.25kg; 2.8lbs for the 70mm and 1.5kg; 3.3lbs for the 80mm), and the compressed lengths of about 380mm (15") and 480mm (18") make them "take it with me" telescopes.

Their optical tubes can be adapted to fit into an airline carry-on bag, or into a hiker's backpack. Whether they are to be used as a beginner's telescope, a "rich-field", a backup, a guide scope or a travelling telescope, the very reasonable prices make them choices to seriously consider. They are quick and easy to set up and the low- maintenance, enclosed optics come fully collimated from the factory. Alignment of the finderscope and polar alignment of the optional equatorial mount are all that are needed to start viewing. The optical tube assemblies are held firmly by hinged, felt-lined "tube mounting rings" which allow easy installation and optical tube rotation and balancing. Mounting one of these telescopes on the supplied aluminum alt-azimuth mount or a photographic tripod is quick and simple with the supplied "multi-function mount plate".

Both telescopes perform well as a fixed aperture lenses for both astrophotography and terrestrial photography. The "fast" focal ratios, combined with today's high speed films, make them useful for capturing lunar and solar eclipses as well as nature photographs. With a suitable T-adapter, a camera can be connected directly to the T-mount thread on the eyepiece holder and a supplied 60mm (2.4") extension tube allows closer focussing for terrestrial photography.

It is comes with a Perfect all-metal alt-azimuth mount AZ3. Which is exceptionally sturdy and easy to operate. It features slow-motion control cables on both axes, allowing horizontal and vertical operation. Heay Duty Pre-assembled Aluminum tripod for convenient and quick assembly with large wall-to-wall accessory tray.

  • Diameter/Aperture: 80mm
  • Focal Length: 400mm
  • F/ratio: F/5
  • Highest Practical Power (Potential): 140x
  • Multi-coated Achromatic objective lens
  • Aluminum tube
  • Eyepiece Supplied (1.25"): 10mm & 25mm
  • Magnification (with eyepieces supplied): x70, x28
  • Diagonal Supplied 1.25”
  • Red dot Finder Scope.
  • Smooth rack-and-pinion 1.25" focuser
  • Dew cap/Sunshade  
  • Alt-Azimuth Mount AZ3
  • Heavy Duty Aluminum Tripod with accessory tray
  • Pre-assembled tripod for convenient and quick assembly.
  • RA & DEC Slow motion manual control cables
  • Tube Rings with gang plate
  • Tripod Height: 67-119cm
  • Tripod Weight: 1.23Kg
  • 36% greater light gathering capacity than traditional beginner 60mm scope
  • Good resolution of the Moon and planets
  • Highly affordable
  • Astronomical or terrestrial observing

Recommend for: Beginners & Advanced

Optical Design

Achromatic Refractor

Diameter / Aperture

80 mm

Focal Length

400 mm

Highest Practical Power


Faintest Stellar Magnitude




Focuser Diameter


1.25" Eyepiece




Finder Scope

Red Dot

Tube Weight


Shipping Weight


Shipping Dimensions

102x42x24 cm3