TS RC 6 Metal Black

Codice articolo: TSRC6M

TS 6" f/9 RC astrograph and travelling telescope - compact Ritchey-Chrétien telescope with 154 mm aperture and 1370 mm focal length - very well suitable for astrophotography

• ♦ Aperture 6" / 154 mm
• ♦ Focal Length 1370 mm
• ♦ Focal Ratio f/9
• ♦ Hyperbolic primary and secondary mirror for very high sharpness on the optical axis and a large well-corrected field for astrophotography
• ♦ Mirrors made of fused silica for stable focus position
• ♦ 99% dielectric high-reflectivy coating on main and secondary mirror for an even brighter image
• ♦ Quicker cooling down thanks to open construction
• ♦ Vixen style dovetail bar for easy attaching to suitable mounts
• ♦ 2" Crayford focuser with 1.25" reduction adapter and circular clamping
• ♦ RC correctors for larger sensors are optionally available
• Optional: CCD47 - 0.67x focal length reduction for photography our recommendation for shorter exposure times

TS-Optics 6" f/9 RC Ritchey-Chrétien Telescope
Most large professional telescope are constructed according to the RC principle. Until recently, these telescopes were unaffordable for amateurs. RC telescopes from Teleskop Service are primarily aimed to amateur astronomers with photographic interest.

These telescopes are perfectly suited for high-resolution astrophotography. Of course, an RC can also be used for visual observing. Here, the large corrected field of view is noticeable, too. In total, the stars are sharper than, for example, in a Schmidt-Cassegrain.

The advantages of the TS-Optics RC Telescopes at a glance:
Hyperbolic primary and secondary mirror for a large fully illuminated field of view.
Astrophotography with camera sensors up to 30 mm diameter possible without corrector. For larger sensors, like full-frame size, Teleskop-Service offers ready-to-use corrector solutions.
99% dielectric high-reflectivity coating on main and secondary mirror for an even brighter image.
Significantly shorter cooling down time through open construction and active primary mirror ventilation.
Internal baffles in the tube for even more contrast.
High back focus for correctors, reducers and also binoviewers.
High-quality 2" Crayford focuser for 2" and 1.25" accessories with compression ring
Due to a redesign of the baffle tube, problems with stray light no longer occur. Nevertheless, the illumination is still very good. Sensors up to full frame format can be used.

Astrophotography with the RC telescope:

Due to the large corrected field of view, you can, for example, use a DSLR up to APS-C format without corrector. Thus the RC is a pure mirror system for astrophotography. The images become ultrasharp.

The generous back-focus also allows attaching correctors which we recommend when using sensors of at least full-frame size. You can also attach a focal reducer, thus further increasing the speed of the RC.

♦ Using an SLR without focal reducer: you need a 50 mm and a 25 mm extension tube between focuser and telescope (item # GSRCV50 and GSRCV25).

♦ Using an SLR with focal reducer CCDT67 or CCD47: in this case, a 50 mm extension tube between focuer and telescope (item # GSRCV50) is sufficient.

0.67x CCD reducer for astrophotography
The CCD47 improves the focal ratio from f/8 to f/5.36, thus reducing the exposure time to less than 50%. With this, you can capture dim nebulae and galaxies with moderate exposure times.

Primary and secondary mirror of quartz glass with 99% reflectivity and protective dielectrical quarz layer: 

Quartz glass does not change its dimensions if temperature changes. When the temperature changes slowly during an exposure, other mirror substrates, like Pyrex, tend to a deformation of the mirror and thus to a shift of the focus. This problem does not exist for mirrors of quartz glass. Thus the focus is better maintained which is very important for long exposures. Both mirrors are coated with 99% reflectivity. The image is obviously brighter than the one of telescopes with only 90% or 94% reflection layer.

The advantages of TS RC telescopes for astrophotography:

The TS RC astrographa are true Ritchey-Chrétien telescopes. Maksutovs and Schmidt-Cassegrains have spherical mirrors and need correctors for making a large field usable. With Schmidt-Cassegrains, you can see the aberrations in the field even when working visually. Most times, Maksutov-Cassegrains are so slow that they are not suitable for astrophotography. RC telescopes have hyperbolical primary and secondary mirrors. They are more difficult to manufacture, but offer a significantly sharper field with less aberrations throughout the field.

Why is the RC Telescope superior to Schmidt-Cassegrain telescopes with correctors:

Celestron EHD or Meade ACF telescopes need a corrector. Additionally, these telescopes have a Schmidt plate at the front side which is prone to dew. The RC is a pure reflection system without lenses in the light path. Thus you can use the complete light even in the infrared range. The image is brighter and the exposure times get shorter. The field of an RC telescope is coma-free by design and relatively flat.

No shifting problem with TS RC telescopes:

Telescopes with focusing via movable primary mirror often suffer from the shifting problem. The image shifts while focusing or even jumps. By now, Meade and Celestron have the problem under control, but the effect is noticable nonetheless. TS RC telescopes do not have this problem, as their primary mirror is fixed. Focusing is done via a high-quality focuser. An additional advantage is the optimal distance from primary to secondary mirror. This gives you the guarantee of the best possible image. If the primary mirror moves relatively to the secondary, you will practically never have the optimal distance.

Technical Data:

Optical Design: True RC with a hyperbolic primary and secondary mirror.
Aperture: 6" / 154 mm
Focal Length: 1370 mm
Focal Ratio: f/9
Resolution: 0.76"
Reflectivity: 99% reflectivity non-tarnishing dielectric mirror coatings
Back Focus: 159 mm from 2" connection of the focuser
Tube Diameter: 191 mm
Tube Length: 500 mm with focuser
Tube Weight: 5.4 kg
Obstruction by secondary: 77 mm
Focuser: 2" dual speed Crayford focuser
Connecting Thread: M90x1
Dovetail Bar: 1x GP style

In the box:

6" f/9 RC Astrograph
2" Crayford focuser with 1.25" adaptor
Vixen style dovetail bar
M90 Extension rings 1x 50 mm and 2x 25 mm
Dust cover