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- Jul 22, 2003
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Telescope: 12" Flexible Dobsonian
by: mercurial
Description: Sky-Watcher 304mm (12") F/1200 Parabolic Dobsonian DOB 12” COLLAPSIBLE A COLLAPSIBLE TRUSS-TUBE DOBSONIAN DESIGN THAT REQUIRES NO REASSEMBLY --THE ULTIMATE CONVENIENCE! SkyWatcher does it again. An old favorite gets a complete facelift with new features and upgraded components! The venerable Dobsonian reflector design has recently undergone some important upgrades and improvements: SkyWatcher is pleased to introduce the all-new Collapsible Dobsonian complete with Crayford focuser – the ultimate in large aperture portability and performance. This elegant truss tube design was carefully engineered to combine ease of use, extreme portability and consistent performance in an affordable package. Unlike other truss tube designs, the SkyWatcher Collapsible Dobsonian does not need to be disassembled between uses. It transports as two compact pieces that can be assembled and ready to use in just seconds! It is easy to collimate once set up, and it holds its collimation throughout the evening! The bearing system has been redesigned as well. The new SkyWatcher Collapsible Dobsonians feature buttery smooth azimuth bearings. Even the twelve-inch model can be rotated with just the push of a finger. Like our traditional Dobsonians, the new Collapsible Dobsonians feature SkyWatcher’s patented tension adjustment control on the altitude bearings. This eliminates the need and added cost of clumsy counterweight systems to balance the telescope. To top it off, all of the new Collapsible Dobsonians are shipping with ultra smooth Crayford focusers. 90 degree finderscope is also available. Contact your local distributor for information. The Sky-Watcher Dobsonian Telescope 304mm/1200mm (12") has a "paraboloidal" primary mirror to eliminate spherical aberration and a four-arm, secondary- mirror bracket with fine supports (0.5mm thick), to reduce diffraction spikes and light loss. In addition, this model include a 2" focuser with a 1.25" adapter, allowing the use of either eyepiece size. This model also include the new feature-tension control handle. PYREX GLASS ON THE 12" The Sky-Watcher 10” Dobsonian features a primary mirror made of Pyrex glass. Because of its very low coefficient of thermal expansion, Pyrex glass is less affected by changing temperatures. This greatly reduces the cooling time of a telescope larger than 8” in dameter without using an extra fan. The great stability of this low expansion glass ensures high quality images. It is also substantially more resistant to scratching then plate glass. Specifications Optical Design - Newtonian (Parabolic) Diameter - 305mm Focal Length - 1500mm Scondary Mirror Diameter - 70mm F/ratio - F/5 Highest Practical Power - 610x Faintest Steller Magnitude - 14.9 Resoving Power - 0.38 Finderscope - 9X50 right angle Focuser diameter - 2” with 1.25” adapter Eyepiece(s) - 1.25” Super Plossl 25mm and 10mm Mount Type - Dobsonian Ground Board Diameter - 632×740 Ground Board Weight(s) - 18.5Kgs Tube Weight - 21Kgs Tube Dimension(dia. x length) - 450×(920-1400) Shipping Carton Dimensions - 106x56x55(cm3) / 78x74x15(cm3) Retails for R12000 locally.
by: mercurial
Description: Sky-Watcher 304mm (12") F/1200 Parabolic Dobsonian DOB 12” COLLAPSIBLE A COLLAPSIBLE TRUSS-TUBE DOBSONIAN DESIGN THAT REQUIRES NO REASSEMBLY --THE ULTIMATE CONVENIENCE! SkyWatcher does it again. An old favorite gets a complete facelift with new features and upgraded components! The venerable Dobsonian reflector design has recently undergone some important upgrades and improvements: SkyWatcher is pleased to introduce the all-new Collapsible Dobsonian complete with Crayford focuser – the ultimate in large aperture portability and performance. This elegant truss tube design was carefully engineered to combine ease of use, extreme portability and consistent performance in an affordable package. Unlike other truss tube designs, the SkyWatcher Collapsible Dobsonian does not need to be disassembled between uses. It transports as two compact pieces that can be assembled and ready to use in just seconds! It is easy to collimate once set up, and it holds its collimation throughout the evening! The bearing system has been redesigned as well. The new SkyWatcher Collapsible Dobsonians feature buttery smooth azimuth bearings. Even the twelve-inch model can be rotated with just the push of a finger. Like our traditional Dobsonians, the new Collapsible Dobsonians feature SkyWatcher’s patented tension adjustment control on the altitude bearings. This eliminates the need and added cost of clumsy counterweight systems to balance the telescope. To top it off, all of the new Collapsible Dobsonians are shipping with ultra smooth Crayford focusers. 90 degree finderscope is also available. Contact your local distributor for information. The Sky-Watcher Dobsonian Telescope 304mm/1200mm (12") has a "paraboloidal" primary mirror to eliminate spherical aberration and a four-arm, secondary- mirror bracket with fine supports (0.5mm thick), to reduce diffraction spikes and light loss. In addition, this model include a 2" focuser with a 1.25" adapter, allowing the use of either eyepiece size. This model also include the new feature-tension control handle. PYREX GLASS ON THE 12" The Sky-Watcher 10” Dobsonian features a primary mirror made of Pyrex glass. Because of its very low coefficient of thermal expansion, Pyrex glass is less affected by changing temperatures. This greatly reduces the cooling time of a telescope larger than 8” in dameter without using an extra fan. The great stability of this low expansion glass ensures high quality images. It is also substantially more resistant to scratching then plate glass. Specifications Optical Design - Newtonian (Parabolic) Diameter - 305mm Focal Length - 1500mm Scondary Mirror Diameter - 70mm F/ratio - F/5 Highest Practical Power - 610x Faintest Steller Magnitude - 14.9 Resoving Power - 0.38 Finderscope - 9X50 right angle Focuser diameter - 2” with 1.25” adapter Eyepiece(s) - 1.25” Super Plossl 25mm and 10mm Mount Type - Dobsonian Ground Board Diameter - 632×740 Ground Board Weight(s) - 18.5Kgs Tube Weight - 21Kgs Tube Dimension(dia. x length) - 450×(920-1400) Shipping Carton Dimensions - 106x56x55(cm3) / 78x74x15(cm3) Retails for R12000 locally.