TS-Optics 8" f/4 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 800 mm focal length:
The strengths of this telescope are compactness and transportability. Astrophotographers will appreciate the Newtonian for the high speed of f/4. With suited correctors, the speed can be increased to f/2.8.

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.

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.

The tube is lined with velour inside

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)
This version is optimized for the standard correctors like the TS coma corrector, the Baader MPCC, the GPU corrector 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
This position is ideal for the use of the ASA Reducer/corrector ASA2KORRR. The reducer brings the system up from f/4 to f/2.8.

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


Leo Triplet - Lars Gunnar Wässing - First Light!

Telescope: ONTC 808 Newton - 8" f/4

Coma Corrector: TS 2,5" WYNNE Korrektor

Gratulation zu diesem vielversprechenden First-Light

 

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

 

Images by a customer from France

Our customer Christophe Vergnes (https://www.astrobin.com/users/Chris.V) from Moselle department in France has succeeded in taking a number of beautiful images with this telescope:

Object: Elephant´s Trunk Nebula in the Cepheus Nebula (IC 1396)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Astrodon LRGB (LRGB2_E27R), Antlia H-Alpha 3 nm (AHA32), Antlia O-III 3.5 nm (AO332), Antlia S-II 35 nm (AS232)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: The Dragon´s Wing (LBN 331)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Astrodon LRGB (LRGB2_E27R), Antlia H-Alpha 3 nm (AHA32), Antlia O-III 3.5 nm (AO332)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: Eagle Nebula (M 16)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Antlia H-Alpha 3 nm (AHA32), Antlia O-III 3.5 nm (AO332), Antlia S-II 3.5 nm (AS232)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: Heart of The Heart Nebula (Mel 15)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Antlia H-Alpha 3 nm (AHA32), Antlia O-III 3.5 nm (AO332), Antlia S-II 3.5 nm (AS232)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: Heart of The Heart Nebula (Mel 15)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Astrodon LRGB (LRGB2_E27R), Antlia H-Alpha 3 nm (AHA32), Antlia O-III 3.5 nm (AO332), Antlia S-II 3.5 nm (AS232)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: Valentine Rose Nebula (Sh2-174)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Astrodon LRGB (LRGB2_E27R), Antlia H-Alpha 3 nm (AHA32), Antlia O-III 3.5 nm (AO332)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: Spiral galaxy in CVn (M 94)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Astrodon LRGB (LRGB2_E27R)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: Wizard Nebula (NGC 7380)

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: Astrodon LRGB (LRGB2_E27R), Antlia H-Alpha 3 nm (AHA32), Antlia O-III 3.5 nm (AO332), Antlia S-II 3.5 nm (AS232)
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))


Object: Moon

Photographer: Christophe Vergnes
Telescope: TS-Optics ONTC 203 mm f/4 Carbon Tube Newtonian telescope (ONTC808)
Focuser: 2" Starlight Feather Touch focuser (FTF2025BCR)
Imaging Corrector: TS Maxfield 0.95x coma corrector (TSKomakorr)
Filters: none
Imaging Camera: ZWO ASI294MM Pro (ASI294MMpro)
Mount: Ioptron CEM70 (C70A))

We thank our customer Christophe Vergnes for these great images!

Customer images from the USA

Our customer Jonathan Middleton from Tacoma in Washington (USA) succeeded in taking very nice pictures with this telescope even at Bortle 7-8:

Object: Fossil Footprint Nebula (NGC 1491)

Photographer: Jonathan Middleton
Telescope: TS-Optics ONTC 203 mm f/4 Newtonian with carbon tube (ONTC808)
Field corrector: TS-Optics NEWTON Coma Correktor 1.0x Superflat 4-Element (TSGPUKomakorr)
Filters: Chroma 36 mm filters LRGB plus 3 nm SHO (alternatives: BA2961612 plus BA2961672, OPL-LRGB-36 plus SHO-3nm-36, LRGB-V36mm plus AHA336MM/AO3336MM/AS2336MM)
Imaging camera: ZWO ASI2600MM Pro (ASI2600MM-P)
Mount: ZWO AM5 (ZWO-AM5-Tripod)
Tripod: ZWO Carbon Tripod for AM5 mount (AM5TRIPOD)


Object: The Ghost of Cassiopeia (IC 63 & IC 59)

Photographer: Jonathan Middleton
Telescope: TS-Optics ONTC 203 mm f/4 Newtonian with carbon tube (ONTC808)
Motor focus: ZWO EAF (ZWO-5V-EAF-S)
Field corrector: TS-Optics NEWTON Coma Correktor 1.0x Superflat 4-Element (TSGPUKomakorr)
Filters: Chroma 36 mm filters 3 nm SHO (alternatives: BA2961672, SHO-3nm-36, AHA336MM/AO3336MM/AS2336MM)
Imaging camera: ZWO ASI2600MM Pro (ASI2600MM-P)
Mount: ZWO AM5 (ZWO-AM5-Tripod)
Tripod: ZWO Carbon Tripod for AM5 mount (AM5TRIPOD)


Object: Wizard Nebula (NGC 7380)

Photographer: Jonathan Middleton
Telescope: TS-Optics ONTC 203 mm f/4 Newtonian with carbon tube (ONTC808)
Motor focus: ZWO EAF (ZWO-5V-EAF-S)
Filters: Chroma 36 mm filters RGB plus 3 nm SHO (alternatives: BA2961612 plus BA2961672, OPL-LRGB-36 plus SHO-3nm-36, LRGB-V36mm plus AHA336MM/AO3336MM/AS2336MM)
Imaging camera: ZWO ASI2600MM Pro (ASI2600MM-P)
Mount: ZWO AM5 (ZWO-AM5-Tripod)
Tripod: ZWO Carbon Tripod for AM5 mount (AM5TRIPOD)


Object: Bubble Nebula (NGC 7635)

Photographer: Jonathan Middleton
Telescope: TS-Optics ONTC 203 mm f/4 Newtonian with carbon tube (ONTC808)
Motor focus: ZWO EAF (ZWO-5V-EAF-S)
Field corrector: TS-Optics NEWTON Coma Correktor 1.0x Superflat 4-Element (TSGPUKomakorr)
Filters: Chroma 36 mm filters LRGB plus 3 nm SHO (alternatives: BA2961612 plus BA2961672, OPL-LRGB-36 plus SHO-3nm-36, LRGB-V36mm plus AHA336MM/AO3336MM/AS2336MM)
Imaging camera: ZWO ASI2600MM Pro (ASI2600MM-P)
Mount: ZWO AM5 (ZWO-AM5-Tripod)
Tripod: ZWO Carbon Tripod for AM5 mount (AM5TRIPOD)


Object: Heart of the Heart Nebula (Melotte 15)

Photographer: Jonathan Middleton
Telescope: TS-Optics ONTC 203 mm f/4 Newtonian with carbon tube (ONTC808)
Motor focus: ZWO EAF (ZWO-5V-EAF-S)
Field corrector: TS-Optics NEWTON Coma Correktor 1.0x Superflat 4-Element (TSGPUKomakorr)
Filters: Chroma 36 mm filters 3 nm SHO (alternatives: BA2961672, SHO-3nm-36, AHA336MM/AO3336MM/AS2336MM)
Imaging camera: ZWO ASI2600MM Pro (ASI2600MM-P)
Mount: ZWO AM5 (ZWO-AM5-Tripod)
Tripod: ZWO Carbon Tripod for AM5 mount (AM5TRIPOD)

Many thanks to our customer Jonathan Middleton for these great photos!

Safety informations: PDF Download