This Sky-Watcher 102mm (4in ) 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 etc. Also a fine terrestrial telescope when mounted on an alt-azimuth mount. Crisp images at a reasonable price make it an excellent beginner's "first telescope", or a great travelling telescope for a more advanced observer. An excellent lens for photography.
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Diameter in mm
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102mm |
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Focal Length in mm
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510mm |
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Focal Ratio
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f/5 |
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Optical Design
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Achromatic Refractor |
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Eyepiece (s)
|
Plossl 10mm, Pl 25mm |
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Mount Type
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AZ3 Alt Azimuth |
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Highest Practical Power
|
240X |
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Resolving Power (arc sec)
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1.14 |
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Tripod
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Adjustable aluminium |
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Faintest Stellar Magnitude
|
13.1 |
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Finder-scope
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Optical 6x30 |
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Focuser Diameter
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50.8mm & 31.7mm |
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Diagonal
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45º erecting diagonal |
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Slow-Motion Control
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Yes both axes |
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Piggyback Bracket
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Yes |
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Accessory Tray
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With tripod |
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Tube Dimensions (dia.x length)
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12cm x 50cm |
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Tripod Height
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71cm to 123cm |
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Shipping Weight/pc
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14Kg |
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Telescopes $99 to $300
