EXPLORE SCIENTIFIC ULTRA LIGHT DOBSON 500MM F/3.6 GENERATION II

EXPLORE SCIENTIFIC ULTRA LIGHT DOBSON 500MM F/3.6 GENERATION II

Ultra Light Dobsonian 406mm GENERATION II - telescope mechanics handcrafted in HUNGARY and GERMANY
Manufacturer : Explore Scientific
SKU : ES-0116950
Price: 7999.00 € incl tax 19% (Germany)
Delivery date : 2-4 weeks
Product description
EXPLORE SCIENTIFIC ULTRA LIGHT DOBSON 500MM F/3.6 GENERATION II

Ultra Light Dobsonian 406mm GENERATION II - telescope mechanics handcrafted in HUNGARY and GERMANY

No telescope type has influenced amateur astronomy as radically as the dobsonian telescope. Before the introduction of this telescope type by John Dobson the vast majority of amateur telescopes were small inadequate refractors on shaky mounts - just good enough to show the polar regions on mars or the rings of Saturn. Bigger telescopes, like the Schmidt-Cassegrain telescopes, were restricted to the relatively small group of amateurs that could afford them.The brilliant combination of simple - but effective - mechanics and the largest aperture available led to a worldwide triumph of this concept. No other telescope type offers you so much light for your money as a good dobson. We have taken the motto "held together by gravity and driven by yoghurt power" and offer a modern version of the classic - designed by amateur astronomers for amateur astronomers. Despite its large aperture the telescope can be transported easily even in small cars and is assembled within minutes without tools. The construction was optimized for maximum rigidity with a minimum of mass. The combination of big altitude wheels and a optimized aluminium-sandwich construction allows for small movements even at high magnifications. The focus position is already positioned to accept our coma-corrector (part No. 0510330). The ideal workhorse for the deep-sky enthusiast. A telescope with 500mm aperture gathers more than 5100-times more light than the naked eye. Details on planetary surfaces stand out even to unexperienced observers, and countless deep-sky objects show details and some color. Bright globular clusters are resolved down to the core and the view of the lunar terminator will provide a unforgettable experience.

Last but not least another gimmick:  The optical tube and the mirror cell are designed to use also on heavy äquatorial mounts.   

Dimensions for mobile use:

DIMS total: 680x680x1790mm; Rockerbox 678mmx678mmx347mm; Mirrorbox 590mmx590mmx361mm; Trusses approx. 1084mm; Truss diameter: 25mm; Eyepiece height while pointing at zenith approximately 1,63m; 20" Total net weight: 53 kg; 20" Mirror Box + Altitude wheels: 35,8kg; 20" Secondary Cage: 3,8kg; Rockerbox: 10,6 kg; 20" 4 Truss pairs: 2,8kg; 20" Primary mirror: 20kg

IMPORTANT NOTE: All current product pictures are showing the prototype. Many hints from our customers have pushed us to make some additional changes which will require some updates.

SPECIFICATIONS
  • Truss-Dobsonian telescope in full Aluminium construction
  • Handcrafted in HUNGARY and GERMANY
  • Fast 20" f3.6 optics with 1800mm focal length
  • Large 120mm secondary mirror (short axis)
  • Quarz primary- and secondary mirror set
  • Laser engraved central mark on primary mirror
  • Eyepiece height while pointing at zenith approximately 1,63m
  • Full welded rigid telescope structure - no rivets and no screws
  • Telescope tube and rockerbox powder-coated
  • Collimation while observing with the delivered tooling
  • DeLuxe 2,5" HEXAFOC focuser with 1:10 gear-reduction
  • 8x50 finder scope with red illuminated reticle
  • Slider bearings made from TEFLON und GRP for smooth and precise movement
  • Improved primary mirror cell with completely redesigned mechanics
  • High precision hinge system for secondary mirror holder
  • Secondary mirror holder with adjustment mechnism along the optical axis
  • 6 larger feet to improve stability
  • Counter-weights (2 x 1.0 kg) included
  • 2 universal finder slots to enable an easy finder position
  • Quick-lock fasteners with new springloaded design for comfortable use
  • Large powder-coated yellow altitude wheels for smooth tracking
  • Altitude wheels can be stored in the mirror box
  • 5 cooling fans are speeding up the cool-down time
SCOPE OF DELIVERY

  • Truss Dobsonian Telescope
  • Individual optical test report for primary mirror
  • 8x50 finder with red illuminated reticle
  • Stray light shield for secondary cage
  • Primary mirror collimation tool
  • Battery compartment with bag for fans
  • Extension tube for focuser
  • Reducer 2"/1.25"
  • Manual

SHIPPING DIMENSION - truck shipment only in order to guarantee a save transport:

BOX1: 600x600x380 approx. 44 kg ; BOX2: 690x690x330 approx. 17 kg ; BOX3: 150x150x1150 approx. 4 kg

Products specifications
Connection to eyepiece2" / with adapter 1 1/4"
Viewfinder8 x 50 Viewfinder with bracket
Secondary diameter120 mm
Resolution0.28"
Aperture500 mm
Max. useful visual power1000 x
Focal length1800 mm
Focal ratiof/3.6
Mirror materialQuarz
Tube weight132 lb
Type of telescopeDobson
FocuserDeLuxe 2,5" HEXAFOC focuser with 1:10 gear-reduction