TS-Optics 8" f/5 ONTC Carbon Tube Newtonian Telescope - fully customizable

ONTC Newtonian Telescopes from Teleskop Service are a unique system on the market

You choose the components and the bias of your telescope and get a Newtonian without compromises for reaching your astronomical goals. Just tell us what you want to do with the telescope and we make it according to your needs.

The ONTC Newtonian with 203 mm aperture and 1000 mm focal length:
The strengths of this telescope is flexibility and transportability. Astrophotographers will appreciate the Newtonian for the good focal ratio of f/5. With suited correctors, the speed can be increased to f/3.5. But the telescope is also very good for moon and planets - it is a real allround telescope.

The advantages of the ONTC telescopes in short:

Optimized configuration for astrophotographic or visual use by choosing different focusers, focus positions or secondary mirror

Exchange of the secondary without problems - anytime

Only selected optics are used. Also the functionality of the optical and mechanical components are tested before sending out the ONTC.

Each ONTC Newtonian telescope comes with a complete manufacturing protocol including star test.

The edge of the secondary is blackened against reflexes and false light.

The carbon tube is made in Germany. It is manufactured in a carbon/rigid foam sandwich construction for a perfect stability at an unbeatable weight ratio

Fantastic temperature compensating performance - barely any temperature based focus drift

The mirror cells are manufactured in Germany, too. The telescope can be collimated completely without tools.

One telescope, many focal distances - due to different correctors! The correctors need different focus positions above the focuser. The tube offers three positions of the primary mirror cell.

TS "Black" anti-reflective paint for maximum contrast

Many of our UNC and all ONTC Newtonian telescopes use the TS-Optics "Black" anti-reflective paint. It darkens the inside of the tube just as well as velour foil. The illustration shows how dark the anti-reflective paint is. The diagram (at the images at the top of this page) shows the direct comparison between the commonly used chalkboard paint and the anti-reflective paint.

Choose a suitable focuser in the "options" list

The free choice of the focuser makes the ONTC Newtonians unique. Thus you can easily adapt your new telescope optimally to your wishes. Please do not forget to select the base for attaching the focuser to the tube. You can choose from our whole range. A few recommendations are given below:

UNCN2-G2 - TS 2" UNC Newtonian Crayford focuser - short

Economically priced 2" Crayford focuser for observing and photography with DSLR cameras. The short focuser needs only 75 mm optical path.

Item number of the necessary base: BAST-UNCN2G2 - please add to your order.



FTF2008BCR - Starlight Feather Touch 2" focuser - 20 mm draw tube travel

The best 2" focuser we know, for maximal stability without compromises. In addition, the focuser is very short, together with the base, it is only 50 mm heigh.

Item number of the necessary base: BA20CL-230mm - please add to your order.



Orion ACU-3S 3" Crayford focuser with M82x1 thread

The massive 3" focuser is our recommendation for astrophotographers who want to work with a 3" Newtonian corrector (N-AGK3, TS 3" Wynne or TeleVue VIP-3010.) These correctors are screwed to the M82 thread of the focuser.

Item number of the necessary base: NB240-ORACU3 - please add to your order.

We recommend three focus positions above the 2" tube of the focuser:

1. astrophotography with the standard coma correctors - 65 mm above the 2" tube (STANDARD Version)
That version is optimized for the standard correctors like the TS coma corrector, the GPU corrector, the Baader MPCC or the ASA Quattro. For visual use, you need to add the 2" extension tube - Art.Nr. TSV235.

2. astrophotographic use with the ASA 2" Reducer/corrector - 90 mm above the 2" tube
That position is ideal for the use of the ASA Reducer/corrector ASA2KORRR. The reducer brings the system up from f/4.5 to f/3.3.

3. Visual use - 35 mm above 2" tube
We recommend that version for visual use of the telescope. For this telescope line, we recommend the 58 mm secondary mirror. The 2" Paracorr VIP-2010 also works fine with this focus position.

The focus positions are calculated and achieved by changing the primary mirrors position. Of course you can also get other positions if you want. For expample if you want to use a 3" coma corrector. The three we mentioned are the most common ones.

Further customizable parts of the ONTC Newtonian telescopes:

If you order the instrument via our webshop, you can send us a notice in the text field below the payment methods. There is a textfield "Informations concerning your order" where you can tell us what you want to have. The alternative is dropping us an email : info@teleskop-service.de

Rings or bar directly connected to the tube - no change of the price:

The scope of delivery also includes rings with a flat base on both sides. According to your wish, we can also attach a dovetail bar (Losmandy or Vixen style) directly to the tube. If choosing that modification, the tube gets additional fibre layers where necessary.

Assembly and collimation instructions

The telescope is delivered disassembled into several units for safety. The assembly and adjustment are not complicated, you can download the instructions in advance. The PDF can be found here.

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

General product video

Teleskop-Service has made an information video about the UNC and ONTC telescopes:

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

 

The TS 8" F5 ONTC Carbon Newtonian Telescope .. a specialist for Astrophotography Presentation of a working combination: telescope / camera / corrector / guiding / filter .. this ONTC Newtonian is perfect for astrophotography because of its good optic but more important ... better mechanic. After transport, I simply make a very fast check of the collimation with the newtonian laser. This needs less than one minute because I the collimation is really good also after a rough transport. I only make one very precice sharpening through the Baader Steeltrack and this is OK for the whole night. To correct the field and to reduce the focal lengh, I use the ASA 2" Reducer/Corrector which converts the Newtonian from F5 to F3,6. This fast optic with a really high resolution is perfect for my CCD Camera ATIK 460 EXM with small 4,54µm pixel. For Guiding, I use the TSOAG9 - our short Off Axis Guider and the LODESTAR , in my opinion, the best Autoguider with a really high sensivity. I never has to search a guiding star. I use the L-RGB Filterset of Baader. I prefer manual Filter Changing with the TSFEK2 Quick Filter Changer. The  stable mount G-11 of Losmandy with Stepper Motors and the famous GoTo System FS2 is the Base for the combination. These are the previews of objects, I have made with this combination. Click on the image for higher resolution. M33 - 240min through the TS ONTC 8" F5 Newtonian NGC 6914 - 285min through the TS ONTC 8" F5 Newtonian Ghost Nebula - 330min through the TS ONTC 8" F5 Newtonian

 

An exceptional customer photo

Our customer Firas Haki from Sweden (www.astrobin.com/users/SilverLynx/) has pointed the 8" telescope toward the Coma galaxy cluster (Abell 1656), 321 million light-years away, and exposed for a total of about 30 hours! The result is impressive:


Object: Coma Galaxy Cluster (Abell 1656)

Photographer: Firas Haki (Sweden)
Imaging date:: 25.02.2022 ff
Imaging telescope: TS-Optics ONTC 203 mm f/5 (ONTC8010)
Motor focus: PrimaluceLab Sesto Senso Focuser
Field corrector: TeleVue Paracorr Type-2
Imaging camera: Moravian G2-8300FW Moravian G2-8300
Filters: Baader 36 mm LRGB
Guiding camera: Starlight Express Lodestar X2
Mouint: Skywatcher EQ6-R Pro
Exposure time: 364 frames of 300" each (30h 20m)
Software: PHD / Pixinsight



Object: Coma Galaxy Cluster (Abell 1656) with designations

Additional information:

Abell 1656 is a large cluster of galaxies that contains over 1,000 identified galaxies!

It is one of the two major clusters comprising the Coma Supercluster. It is located 321 million light years away in the constellation Coma Berenices.

The central region is dominated by two supergiant elliptical galaxies: NGC 4874 and NGC 4889, center-right in this image.

The latter contains one of the most massive black holes known. It is 5,200 times more massive than the central black hole of the Milky Way.


Many thanks to Salvatore from Astrobin and Firas Haki (Sweden) for sharing this beautiful shot of the Coma Galaxy Cluster (Abell 1656)!

Customer photos from Canada

Our customer Tudor Chibacu (www.astrobin.com/users/Tudor_Chibacu/, www.astrophotoygk.com/) has photographed several emission nebulae with this telescope::

Object: Boogeyman Nebula (LDN 1622)

Photographer: Tudor Chibacu (Ontario, Canada)
Imaging Telescope: TS-Optics ONTC 203 mm f/5 (ONTC8010)
Auto Focuser: Deep Sky Dad Autofocuser V3
Rotation Adapter: Artesky M48 360° rotator (ART8252)
Field Corrector: TS GPU 2" coma corrector (TSGPU)
Imaging Camera: QHY268m
Filters: Antlia LRGB Filters (LRGB-V2) and Antlia H-Alpha 3 nm Pro (AHA32)
Guiding Scope: 50 mm Mini Guide Scope (TSL501)
Guiding Camera: ZWO ASI120MM Mini (ASI120mini)
Mount: Skywatcher EQ6-R (EQ6-R)
Power Supply: PegasusAstro Pocket Powerbox Advance (PEG-PPBADV)
Exposure Time: 26 h for H-alpha and RGB together



Object: Sharpless 140 (SH 140)

Photographer: Tudor Chibacu (Ontario, Canada)
Imaging Telescope: TS-Optics ONTC 203 mm f/5 (ONTC8010)
Auto Focuser: Deep Sky Dad Autofocuser V3
Rotation Adapter: Artesky M48 360° rotator (ART8252)
Field Corrector: TS GPU 2" coma corrector (TSGPU)
Imaging Camera: QHY268m
Filters: Antlia LRGB Filters (LRGB-V2) and Antlia H-Alpha 3 nm Pro (AHA32)
Guiding Scope: 50 mm Mini Guide Scope (TSL501)
Guiding Camera: ZWO ASI120MM Mini (ASI120mini)
Mount: Skywatcher EQ6-R (EQ6-R)
Power Supply: PegasusAstro Pocket Powerbox Advance (PEG-PPBADV)
Exposure Time: 26 h for H-alpha and RGB together



Object: Lion Nebula (SH2-132)

Photographer: Tudor Chibacu (Ontario, Canada)
Imaging Telescope: TS-Optics ONTC 203 mm f/5 (ONTC8010)
Auto Focuser: Deep Sky Dad Autofocuser V3
Rotation Adapter: Artesky M48 360° rotator (ART8252)
Field Corrector: TS GPU 2" coma corrector (TSGPU)
Imaging Camera: QHY268m
Filters: Antlia SII 3 nm Pro (AS232), Antlia H-Alpha 3 nm Pro (AHA32) and Antlia OIII 3 nm Pro (AO332)
Guiding Scope: 50 mm Mini Guide Scope (TSL501)
Guiding Camera: ZWO ASI120MM Mini (ASI120mini)
Mount: Skywatcher EQ6-R (EQ6-R)
Power Supply: PegasusAstro Pocket Powerbox Advance (PEG-PPBADV)
Exposure Time: 20 h for SHO together



Objekt: Part of the Soul Nebula (IC 1871)

Photographer: Tudor Chibacu (Ontario, Canada)
Imaging Telescope: TS-Optics ONTC 203 mm f/5 (ONTC8010)
Auto Focuser: Deep Sky Dad Autofocuser V3
Rotation Adapter: Artesky M48 360° rotator (ART8252)
Field Corrector: TS GPU 2" coma corrector (TSGPU)
Imaging Camera: QHY268m
Filters: Antlia SII 3 nm Pro (AS232), Antlia H-Alpha 3 nm Pro (AHA32) and Antlia OIII 3 nm Pro (AO332)
Guiding Scope: 50 mm Mini Guide Scope (TSL501)
Guiding Camera: ZWO ASI120MM Mini (ASI120mini)
Mount: Skywatcher EQ6-R (EQ6-R)
Power Supply: PegasusAstro Pocket Powerbox Advance (PEG-PPBADV)
Exposure Time: 24 h for SHO together


Many thanks to Tudor Chibacu from Ontario (Canada) for these fantastic pictures!

Safety informations: PDF Download