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Sky-Watcher 102 x 500mm Refractor (Black Diamond)

Recommended Retail Price: R6,925.50

This Sky-Watcher 102mm (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 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.





  • Recommend for: GENERAL

    Optical Designshort tube Refractor
    Lens Material
    Diameter102mm
    Focal Length500mm
    Scondary Mirror Diametern/a
    F/ratioF/5
    Highest Practical Power204x
    Faintest Steller Magnitude13.1
    Resoving Power1.13
    FinderscopeRed Dot Finder*
    Focuser diameter2” with 1.25” adapter
    Diagonal45º Erect Image*
    Eyepiece(s)1.25” Super 25 and 10*
    Mount TypeAlt-Azimuth
    Slow-motion ControlVertical & Horizontal
    Counterweight(s)n/a
    Piggyback BracketYes
    Accessory TrayWall-to-wall
    Ground Board Diametern/a
    Ground Board Weight(s)n/a
    Motor DriveGOTO both axis
    Go-ton/a
    Tube Weight2.53 Kgs
    Tube Dimension(dia. x length)10cm x 47cm
    Tripod Height71-123cm
    Shipping Weight15.2Kgs
    Shipping Carton Dimensions96.5 x 45 x 26 cm3


    • Model: BK1025AZGT
    • Shipping Weight: 15lbs
    • 12 Units in Stock
    • Manufactured by: Sky-Watcher


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