Geoptik Dobson NADIRUS 12″ telescope

Every part of this Dobson has been designed and engineered taking into account a variety of technical and practical aspects. With an extremely curvy design it is an excellent instrument produced in Italy with the best Italian style. The quality of materials is the best available on the market and technical solutions makes it absolutely unique.

The graphic motif that characterizes the NADIRUS Dobson is the design of the wheel that identifies in the intersection of 6 circles of different diameters, and some suitably radiused corners, that will surround the profile. These curves are repeated on the body of the base with the aim of lightening.

Even the base of the rotating system has been lightened with a pattern, unique, reminiscent of the blades of a fan. Attention to the design, technique and mechanics, in the name of practicality which has been the dominant theme of this project. 

Structure in lamellar beech wood makes stability and lightness. In particular, it has been taken care of the upper cylinder housing is where the spider secondary mirror holder which was made ​​of birch plywood crossed beams that give the piece a unique strength and stability. Although the primary mirror cell is made of birch plywood with a support system where the 9-point floating mirror rests on discs of natural cork foam.

The entire structure is varnished for outdoors. 

TECNICAL SPECIFICATION

Type: DOBSON TRUSS
Optical design: Newtonian
Clear aperture: 304 mm (12”)
Focal length: 500 mm
Fopcal ratio: f/5
Secondary mirror: 70 mm (3 inch)
Mount type: Wood Dobsonian
Primary cell: 9 point floating aluminium maschined
Secondary holder: hight precision aluminium assembly
Focuser: ual speed rack and pinion 2″+1.25″ low profile.
Alignment: manual
Finder: Not included
Radius altitude bearings diam.: 480 mm
Truss tubes: Powder painted alu.tubes diam. 20mm with plastic balls.
Alt movement: By teflon
Azimuth movement: By teflon
Total assemble telescope weight: 23.4 Kg
Heaviest part: 13.8 Kg.
Eyepiece height (zenith): 1420 mm

Primary mirror: BK7 with correction of more than 1/5 lambda (PTV), with protective treatment (SiO2) 91% reflectivity
Secondary mirror: correction greater than 1/4 lambda (PTV) protective coating (SiO2) 91% reflectivity