Optical set:Newtonian AstrographDiameter:200mmPirmary mirror diameter:206mmSecondary mirror diameter:88mmFocal lenght:800mmFocal ratio:F/4.0Mirror material:Pyrex (Astrositall on request)Linear obstruction:40mmIlluminated field:40mm with recommended coma corrector Dimensions:720 L x 252 W x 262 H mmWeight:11.4 kgTube material:High End Carbon fiber Mechanical material:Aluminium 6061
We designed the ARTEC astrographs series to serve a market of discerning astrophotographers who are especially concerned with ease and stability of collimation, optical quality and repeat ability of results.
To achieve all these goals, we soon realized tha we couldn't look anymore at the telescope as at a standalone entity, but we had to consider it for what it is: a part of an acquisition system which includes everything from the tube of the CCD.
For example, in the design stage we paid special attention that no tilts are introduced by the draw tube of the focuser, we observed that several well-known focusers are simply unable to deliver according to their specs and to their price and that the carbon tube shows no flexures under the cantilever load of heavier cameras.
Also, when delivering complete instruments with correctors, we make sure that the mechanical adapter between the focuser and the corrector is custom machined on the outside diameter of each individual corrector, to prevent misalignments in the optical train.
In our view, the main technical advantage of the carbon fiber, versus the thin metal used in some Far-East constructions, is more related to its thermal stability and overall rigidity than to just lighter weight.
This having said, there is clearly a technical cost to pay for all this extra rigidity and stability, and the weight of the ARTEC 200 is in turn somewhat higher than of other telescopes with the same aperture and optical design; it is still however fully manageable in the field, and well within the practical working range of very common and affordable mounts.