EXPLORE SCIENTIFIC ULTRA LIGHT DOBSON 500MM 20 "F / 3.6 GENERATION II

Grid pipe dobson in all-aluminum construction
Handmade in HUNGARY and GERMANY
Quartz main and secondary mirrors with test certificate
Low viewing height of only 1.63m in the zenith
Extremely high rigidity of the construction
Main mirror adjustable during observation
Very portable thanks to its compact transport dimension
Tubular structure completely welded - without rivets and screws
DeLuxe 2.5 "HEXAFOC Focuser with 1:10 fine adjustment
Large powder-coated wheels enable smooth movement

EXPLORE SCIENTIFIC Ultra Light Dobson 500mm f / 3.6 GENERATION II
Ultra Light Dobson 500mm GENERATION II - a telescopic handcraft handmade in HUNGARY and GERMANY

No type of telescope has changed amateur astronomy as much as the Dobsonian telescopes. Prior to John Dobson's presentation of the Dobsonian telescope, the vast majority of amateur telescopes consisted of small, primitive-mechanism lens telescopes - just enough to divine the polar ice caps of Mars or the rings of Saturn. Larger telescopes, such as Schmidt-Cassegrains, were reserved for a well-to-do clientele. The ingenious combination of simple but effective mechanics with the widest possible opening has given the Dobson telescope a unique triumphal procession worldwide. Nowhere do you get as much light for your money as with a good dobson. We have heeded the principle "Held together by gravity and driven by yoghurt power" (powered by gravity and powered by yoghurt energy) and created a completely redesigned modern dobsonian telescope with a lattice tube. The dismantling of the device allows trouble-free transport of this large device even in small cars - the structure is completely tool-free within a few minutes. The entire construction has been optimized for maximum rigidity and minimum weight. The combination of large height wheels with an optimized aluminum sandwich construction allows the finest correction movements at the highest magnifications. The focus position has already been prepared for the use of our Komakorrektor (Item No. 0510330). The ideal workhorse for the deep-sky observer. A device with 500mm mirror diameter collects more than 5100 times as much light as the naked eye. Details on planets are also visible to inexperienced observers, and countless deep-sky objects show structures and even color. Bright star clusters are resolved to the core, and the sight of the Terminator on the moon becomes an unforgettable experience.

The fast 20 "f3.6 primary mirror as well as the large 120mm secondary mirror are made of high quality quartz material, which reduces the cooling time to a minimum and the Dobsonian is ready for use quickly.Each main mirror comes with an individual optical test certificate All optical surfaces have a high-quality aluminum coating with 94% reflectivity and an extremely resistant quartz protective layer, which means that the main mirror will withstand frequent dewing and cleaning every now and then Damage and guarantees a long life.

A complete redesign of this Dobson was required to ensure the significantly increased rigidity and load bearing requirements for optical components. All connections of the tube structure were made by TIG welding and rivets and screws were omitted. Thus, we succeeded in producing this 20 "lightweight Dobson so incredibly torsionally rigid despite the low weight - a noticeably good quality is second to none.The production of almost all mechanical components takes place at our partners in Hungary and the final assembly of the optics plus final quality control takes place in Germany at the Rhede site.


The equipment details of the smaller Dobson models, which have been popular for years, were of course taken over and even significantly expanded. First, of course, is the very good disassembly and transportability. Without any tools, the assembly and disassembly can be done. The main and secondary mirrors are adjustable during observation and only two setscrews have to be moved. Through the use of precision ball heads in the main mirror cell and a precision hinge for the catch mirror recording, the adjustment works absolutely smoothly and guarantees excellent adjustment stability. All connecting parts of the Tubusstreben are now made of CNC milled aluminum and are accommodated by fit screws made of stainless steel without play. The secondary mirror can now also be adjusted by adjusting screws in the direction of the optical axis. The 2.5 "HEXAFOC focuser with 1:10 fine adjustment is used for years - this allows vignette-free observation despite the fast opening ratio.A second 40 ° offset mounting plate with viewfinder shoe allows the rotation of the tube top in conjunction with a The 6 legs under the Rockerbox provide a high level of stability and ensure smooth azimuth tracking, while the 4 smaller fans mounted on the side of the mirror box and a large fan installed under the main mirror allow for even faster operation Adjustment to the ambient temperature and reduce boundary-layering (see-through) The side elevation wheels can now be easily stored in the foam inserts of the mirror box.

Last but not least, a special gimmick: The optical tube including mirror cell is mechanically designed for operation on a heavy Equatorial mount!

Transport dimensions for mobile use:

Rockerbox 678mmx678mmx347mm; Mirror box 590mmx590mmx361mm; Bar length approx. 1084mm; Viewing height in zenith approx. 1.63m; 20 "total weight: 53 kg; 20 "mirror box with height wheels: 35,8kg; 20 "top with secondary mirror: 3,8kg; Bottom part Rockerbox: 10.6 kg; 20 "4 strut pairs: 2,8kg; Weight main mirror: 20 kg

NOTE: The current product photos show the prototype. At the suggestion of our customers, numerous improvements have been implemented that still require updating.

CHARACTERISTICS
Grid pipe dobson in all-aluminum construction
Handmade in HUNGARY and GERMANY
Fast 20 "f3.6 optics with 1800mm focal length
Large 120mm secondary mirror
Quartz main and secondary mirrors with test certificate
Laser engraved primary mirror center mark
Low viewing height of only 1.63m in the zenith
Extremely high rigidity of the construction
Tubular structure completely welded - without rivets and screws
Tubus and Rockerbox completely powder-coated
Main mirror adjustable during observation
DeLuxe 2.5 "HEXAFOC Focuser with 1:10 fine adjustment
8x50 finderscope with illuminated crosshair
Slide bearing made of TEFLON and GFK, therefore very sensitive tracking
Improved primary mirror cell with precise adjustment mechanism
Precision hinge for the capture mirror recording
Fang mirror holder with adjustment mechanism along the optical axis
6 Large feet for optimum stability
Balance weights 2 x 1.0 kg included
2 mounting plates with universal viewfinder shoe
Quick-release fasteners with spring element for comfortable handling
5 fans for fast temperature adjustment
Large powder-coated wheels enable smooth positioning
Altitude wheels can be stored in the mirror box

DELIVERY:
Lattice tube 20 "Dobson telescope
Test certificate for primary mirror
8x50 viewfinder with viewfinder holder
Stray light protection for secondary mirror cage
Balance weight 1,0kg (2 pieces)
Adjustment tool for primary mirror
Battery box with pocket for fans
Extension sleeve for focuser
Reducing Adapter 2 "to 1.25"
operating manual

Available from 15 November 2017

Delivery in 3 packages only possible by freight carrier to ensure safe transport:

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

Technical specifications
APPLICATION
application
Deep-Sky observation
planetary observations
TARGET GROUP
target group
advanced
Specialists and research
visual observer
PRODUCT FAMILY
Family reflecting telescope
OPTICAL FEATURES
Optical design reflecting telescope to Newton
Magnification of 40
Maximum recommended magnification 1000
Material main mirror quartz
Main mirror diameter 500 mm
Material catching mirror quartz
Secondary mirror diameter 120 mm
Focal length 1800 mm
3.6 aperture ratio
Resolution 0.28 arc seconds
Finderscope 8 x 50 mm - illuminated
of mount Dobson
ELECTRONICS, HARD & SOFTWARE
Required batteries2 2x LR41, 1.5V
Batteries included ✓
GENERAL SPECIFICATIONS
Material tube aluminum
Bearings in azimuth / RA Teflon
Bearings in elevation / DEC Teflon
Focusing Drive 2.5 "Hexafoc DeLuxe with 10: 1
Color: Black
Standard Warranty 2
Warranty after online registration 5 years
DIMENSIONS & WEIGHTS
Total length 68 cm
Total width 68 cm
Total height 179 cm
Net weight (including accessories) total 53 kg
Eyepiece plug-in diameter 50.8 mm

k.k.