TS-Optics ONTC 203 mm f/6 Newtonian telescope with 2" Baader Diamond Steeltrack focuser

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 1200 mm focal length:
The strength of this telescope is its versatility and excellent performance in the highest magnification range. The telescope offers very high sharpness for the moon and planets, which corresponds to a 6? APO. With small correctors up to 16mm diameter, deep sky photography is even possible without a corrector. For larger correctors, a simple 2-element corrector such as the Baader MPCC is sufficient.

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.

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.

General product video

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

Safety informations: PDF Download