Bintel GSO RC8 Metal Specifications
|254mm From rear cell, 159mm with focuser installed|
The GSO RC8 8″ f/8 Astrograph is a superb telescope for teasing out fine low surface brightness detail invisible in other scopes. Ideal for smaller deep sky targets such as galaxies, small globular clusters and planetary nebulae. The f/8 focal ratio is faster than competing f/10 SCT and coma free designs.
The RC design uses no lenses or corrector plates so there is no false colour at all. It is also less prone to dew problems associated with corrector plates on Schmidt and Maksutov Cassegrain systems.The GSO RC8 Astrograph is a real Ritchey-Chrétien reflector telescope. Unlike Maksutov or Schmidt-Cassegrains which have spherical mirrors and need image correctors, and contrary to Newtonians that need coma correctors, the RC system is a well corrected photographical instrument and does not require any corrector with most cameras up to APS sized sensors. Those using full frame sensors may wish to use a field flattener for pin point stars across a very wide field.
Optics (primary and secondary mirrors) use low expansion Quartz glass and feature enhanced aluminium coatings with a silicon dioxide (quartz) overcoat providing 96% reflectivity. The enhanced aluminium coatings are not as tough as dielectric coatings (used on the RC8 carbon tube) however their transmission characteristics make them a suitable choice for special imaging applications and spectroscopy outside visible wavelengths.
Each optical set is thoroughly tested by the manufacturer.
For consistant quality each optical set is tested and hand-corrected after the automatic production with state-of-the-art machinery. Final testing of the optical set is performed by laser interferometry. Collimation of the secondary and primary mirror set is also performed by laser interferometer during final stages of assembly.
Mechanical Advantages of the GSO RC Astrographs
– Fixed primary mirror cell and focusing by Crayford focuser eliminates image shift
– Computer-optimized baffle system to eliminate stray light
– Ample backfocus to accomodate longer imaging trains with filter wheels, off-axis guiders and rotators
– Rear cell uses M90x1 threaded connections allowing the use of third party focusers from Optec and others should you wish to upgrade the focuser
Note: Image shows narrow guidescope mounting rail – this is not supplied with the telescope but can be purchased separately.