Manufacturer: -TS Teleskope
Product number: TSRC8C

EUR 1.549,00


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rating: 5.0 of 5
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TS-Optics GSO 8" f/8 RC Ritchey-Chrétien Telescope with Carbon Tube
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
Internal baffles in the tube for even more contrast.
High back focus for correctors, reducers and also binoviewers.
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 TS-Optics 8" RC telescope:

Better and sharper astrophotos without corrector with shorter exposure times. This is exactly what this RC telescope allows you to do with astro cameras and SLRs up to APS-C sensors. As a pure mirror system, you can even use the infrared light. You can achieve up to 25% shorter exposure times and sharper imaging than, for example, through a comparable Schmidt-Cassegrain telescope. For the use of a reflex camera without focal length reduction you need the 50mm and the 25mm extension between focuser and telescope.

The generous backfocus also allows the connection of correctors, which we recommend from the use of full-frame sensors. You can also connect a focal length reducer, thus further increasing the light intensity of the RC.



Astrophotographic results obtained with this telescope on Astrobin
The RC telescopes are very well suited for astrophotography. Here you can find some astrophotographs made with this telescope model: Link to Astrobin


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.



The advantages of a carbon tube over a metal tube:
The weight reduction is minimal - only about 300 grams - the main advantage ist the focus stability when temperature changes. That is important for astrophotography. When temperatures drop, metal contracts and the focus moves. Refocusing is necessary. A carbon tube does not change, the combination of quartz glass mirror and carbon composite tube makes a readjustment of the sharpness obsolete, even for long time exposures.



The 2" MONORAIL focuser - more than a Crayford:

The Monorail focuser combines the ease of movement of a Crayford focuser with the stiffness of a rack-and-pinion focuser. Thus astrophotography becomes a success.
Massive stainless steel bar instead of small ball bearings for more stiffness.
No tilting anymore when locking the drawtube.
360° rotation for optimal object alignment
Female M69x1 thread for threaded adaptions
2" and 1.25" compression rings for push adaptions
1:10 dual speed for accurate focusing
Motor focus can easily retrofitted
Lined scale for quick retrieving of the focus.
Easy operation




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 astrographs 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.

Adjusting the RC telescope
We recommend the TSRCKOLLI or an collimating telescope for adjusting the telescope. These tools are linked in the "Cleaning & Collimating" section.
Optical Design:True RC with a hyperbolic primary and secondary mirror
Aperture:203 mm / 8"
Focal length:1624 mm
Focal ratio:f/8
Resolution:0.58"
Reflectivity:99% reflectivity non-tarnishing dielectric mirror coatings
Back focus:254 mm from the tube´s backside or 159 mm from the 2" receptacle of the focuser
Tube Diameter:230 mm
Tube Length:580 mm with focuser
Weight:7.6 kg with focuser and dovetails
Tube Material:Carbon composite with internal baffles
Total Obstruction by Secondary:85 mm
Focuser:2" dual speed MONORAIL
Connection Thread:M90x1
Dovetail Bars:1x GP, 1x Losmandy style, each 395 mm long
8" f/8 RC Astrograph
2" dual speed MONORAIL focuser
2x Dovetail
M90 extension tubes for easy reaching of the focus
Collimation manual

Astrophotographic results obtained with this telescope on Astrobin
The RC telescopes are very well suited for astrophotography. Here you can find some astrophotographs made with this telescope model: Link to Astrobin


Astrophotos through the TS 8" RC:



M92 - Reinhard I.
In the section (remark: "Recommended Accessories"), besides the flattener, two 0.67 x reducers are also offered. I would like to point out to you that your TS Photoline Reducer 0.79 x (TSRed279) also gives excellent results with the 8" RC format, giving an interesting compromise between detail and speed with a focal length of about 1300 mm.




M27 - C. Frere
Cameras: Atik383L+ for H-Alpha and O-III
Farbe/Color: QHY8L





M20 - Hamish Thava
L-RGB
Camera: Starlight SXVR-H694
Filter: Baader L-RGB
Mount: Skywatcher EQ6 Synscan





NGC891 - Wolfi Ransburg
Camera: ATIK 4000 Mono
no corrector
12x 12min





Andy Murner
Moon (valley in the moon alps)
DMK Camera from Imaging Source






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Reviews

Written by Kamen Andreev
on 2021-11-13

Verry good Telescope.
Good and colimated optics.
The Focuser working fine with 700gr. load.
I like it.