Manufacturer: -TS Teleskope
Product number: GSRC12M

EUR 3.890,00


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TS-Optics 12" f/8 RC Ritchey-Chrétien Telescope
Most large professional telescopes are built according to the RC principle. RC telescopes from Teleskop-Service are primarily intended for amateur astronomers with photographic interests. These RC telescopes are ideal for astrophotography with high resolution. Of course it is also possible to observe through an RC. The large corrected field of view is also noticeable here. The stars are generally sharper than for example in a Schmidt-Cassegrain.

This 12" RC is especially suitable for fixed installation. The full tube protects the optics from stray light and dew. We recommend a stable mount for the 12" RC, such as the EQ8 or the Celestron CGX-L.

The advantages of TS-Optics RC telescopes at a glance:
Hyperbolic primary mirror and secondary mirror for a large fully corrected field of view.
Astrophotography with camera sensors up to 30 mm diameter is also possible without corrector. For larger sensors, for example with full frame size, Teleskop-Service offers ready-to-use corrector solutions.
99 % mirroring and dielectric coating on primary and secondary mirrors for an even brighter image.
Significantly faster cooling time due to open design and active main mirror ventilation.
Large back focus for correctors, reducers or binocular approaches
High-quality 3" MONORAIL focuser with M69x1 threaded connection and 2" / 1.25" plug-in connection.


Astrophotography through the RC telescope:
Due to the large corrected field of view of the RC telescopes you can take pictures with SLR cameras up to APS-C format without corrector. The RC is therefore a pure mirror system for astrophotography. The images become ultra sharp. The infrared light no longer needs to be blocked out, it can be used for image formation. Thus the exposure time is further reduced.

For exposures directly in focus you will need the M117x1 extension tubes, which are included in delivery. These are screwed between the telescope and the focuser and thus reduce the back focus.

The generous backfocus also allows the connection of correctors, which we recommend from the use of full-frame sensors onwards. You can also connect a focal reducer to further increase the speed of the RC.

You can clamp the camera directly via the 2" receptacle or you can screw everything together via the M69x1 internal thread of the focuser. Suitable adapters can be found in the accessories section.

The 3" MONORAIL focuser - more than just a Crayford:

The Monorail focuser combines the smoothness of a Crayford focuser with the stiffness of a rack and pinion focuser. This makes astrophotography a success.
Solid stainless steel guide rail instead of small ball bearings for more stiffness.
No more tilting when clamping the draw tube.
360° rotation for optimal object orientation.
M69x1 female thread for screw adaptations
2" and 1.25" compression rings for push-fit adaptations
1:10 gear reduction for accurate focusing
Motor focus can be easily retrofitted
Dash scale, so that the focus is quickly restored.
Easy to use


Astrophotography through the RC telescope:

Because of the large corrected field of view of the RC telescopes you can take pictures with SLR cameras up to APS-C format without corrector. The RC is therefore a pure mirror system for astrophotography. The images become ultra sharp.

The generous backfocus also allows the connection of correctors, which we recommend from the use of full-frame size sensors. You can also connect a focal length reduction to further increase the speed of the RC.
Use of an SLR camera without focal length reduction: You need a 50 mm and a 25 mm extension between the focuser and the telescope (Art.No. GSRCV50 and GSRCV25)
Use of an SLR camera with focal reducer CCDT67 or CCD47: Here a 50 mm extension between focuser and telescope (Art.No. GSRCV50) is sufficient.


OFFER 0.67x CCD Reducer for astrophotography at a special price
The CCD47 improves the focal ratio from f/8 to f/5.36, thus reducing the exposure time to below 50%. This allows you to capture faint nebulae and galaxies with moderate exposure times.

Save money! If you buy this RC telescope and the CCD47 directly from TS at the same time, you get the reducer at a special price. Of course, the special offer model CCD47 is an absolutely new part with full warranty. More information about the CCD47


Primary mirror and secondary mirror made of fused silica with 99% reflection and dielectric quartz protection layer:
Quartz glass does not change its properties at temperature differences. If the temperature slowly drops during the exposure, other mirror materials, such as Pyrex, will cause the mirror to deform and thus shift the focus. This problem does not exist with quartz glass mirrors. The focus is therefore held better, which is very important for long exposures. Both mirrors are 99% mirrored. The image is visibly brighter than with telescopes with only 90% or 94% reflectivity.

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 to make a large field usable. With Schmidt-Cassegrains, the errors in the field can even be seen in visual use. Maksutow cassegrains are usually so faint that they are not suitable for astrophotography. RC telescopes have hyperbolic main and secondary mirrors. These mirrors are more difficult to manufacture, but offer a much better field sharpness and much less errors in the field.

Why is an RC telescope superior to a Schmidt-Cassegrain with correctors:
Celestron EHD or Meade ACF telescopes require a corrector. In addition, these telescopes have a Schmidt plate on the front side which is prone to dew. The RC system is a pure reflective system without any lenses in the beam path. This allows you to use the full light also in the infrared range. The image is brighter and the exposure times are shorter. The image field of an RC telescope is by nature relatively flat and coma-free.

No shifting problem with TS RC telescopes:
Telescopes with primary mirror focusing often suffer from the "shifting" problem. The image shifts when focusing or it even jumps. Meade and Celestron now have the problem under control, but the effect is still noticeable. TS RC telescopes do not have this problem because the primary mirror is fixed. The focusing is done by a high quality focuser. An additional advantage is the optimal distance between primary and secondary mirror. With this you have the guarantee of the best possible image. If the primary mirror shifts towards the secondary mirror, you practically never have the optimal distance.

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

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.

Instruction video
Teleskop-Service has created an instruction video about collimating an RC telescope:


Optics:RC Ritchey-Chrétien optics
Aperture:304 mm / 12"
Focal Length:2432 mm
Focal Ratio:f/8
Resolution:0.38"
Reflectivity:99% reflectivity non-tarnishing dielectric mirror coatings
Back focus:233 mm from the back, 127 mm from the 2" receptacle of the focuser
Connection at focuser:2", 1.25" and M69x1 thread (female)
Tube Diameter:356 mm
Tube Length:890 mm without focuser - 1010 mm with focuser
Weight:20.5 kg
Total Obstruction by Secondary:150 mm
Dovetail bars:2x Losmandy style with tube rings
Dimensions transport box:1150 x 530 x 510 mm (LBH)
Weight shipping box:32 kg
TS 12" f/8 RC astrograph - with steel tube
Losmandy style dovetail bars on both sides
Tube rings with flat connecting surfaces on both sides
3" Monorail focuser with reduction 2" and 1.25
M117 extension tubes (2x 25 mm and 1x50 mm)

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


M82 through the TS 12" RC
Patrick Otto

 M82 Patrick Otto 12inch TS RCclick on the image to see full resolution

44 x 4 minutes - with Canon EOS 1000DA at ISO 800
-- Reduction of the focal length with CCDT67

--

NGC891 made with TS 12" f/8 RC
Ivo Tschager

NGC 891 - TS RC 12
click on the image for a bigger size

-- Telescope: 12" f/8 TS RC Telescope
-- Camera: modified Canon EOS 500D
-- Exposure time: 48x12min
-- Astrophotographer: Ivo Tschager

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The 12" RC of TS as club telescope of the Sternfreunde Franken


http://www.sternfreundefranken.de/aktuelles.html


... ...it´s a real pleasure to work with this instrument. To choose the 2.5 Feathertouch as focuser has proven to be a great choice. And the optical quality leaves nothing to be desired and meets our high expectations. But more about that later.


For the first light I chose my ST10XMe and as object M51. Attaching the ST10XME with Astro-Physics reducer to the 2.5 inch Feather-Touch was no problem via the 2 inch connector. At 21:15 I made the first test image. Already the 2 minutes exposure was awesome. What would only show 10 minutes. When the picture appeared on my laptop, I almost fell off my chair, so fantastic was the sight. Lured by my joy call, my co-observers came to the laptop. Each of my fellow observers had a smile on his face and a broad grin when looking at the picture.


Then I started the series.


The sky was a bit hazy and windy at the beginning. But got better and better. Around 1:30 I measured my highest value of 21.2 with the SQM.
After the end of the series and when I had removed the CCD, we had the idea to do visual firstlight with the device. So I went to some standard objects, the globular clusters M3, M5, M13, Ring Nebula and the galaxies M65, NGC2903 and finally Mars. The globular clusters were nicely resolved at V=240x to the center and showed beautiful star chains with pinpoint stars. Also M57 was great, the galaxies were missing some light. But okay 12 inch. At Mars we saw then that the air turbulence was rather average. It was still wobbling a lot.


Satisfied, we went home at 2:30.
Today I analyzed and processed the images. Here´s the result:
http://www.sternfreundefranken.de/php/view.php?pid=372


The tracking was not quite optimal yet. But you can hardly see it on the picture. The device combination showed 0.8" per pixel in 1x1 bining. The FWHM value was 3.4 pixels, which corresponds to 2.5 arcseconds. This makes high demands on the tracking accuracy. The tracking error this night was up to 1 pixel. This was apparently still too high. Here I must optimize the tracking parameters next time.


Nevertheless I am very satisfied with the result. I am looking forward to the next observation with the instrument.


Greeting
Michael


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