TS 6" f/4 ONTC Newtonian Telescope - a well thought-out Telescope for Mobile Use
The strength of this telescope is its versatility and compact dimensions. This makes the ONTC6 the ideal telescope for mobile use, be it for astrophotography or even for observing. The Newtonian is still supported by compact mounts, such as the Skywatcher EQ5.

Three focus positions provide flexibility:
By moving the primary mirror mount, you can freely determine the focus position above the 2" receptacle. Different correctors also give you different focal lengths.

Pos. 1 - Astrophotography with normal coma correctors - about 60 mm above the 2" receptacle (middle primary mirror position)
This version is optimal for all coma correctors with 55 mm working distance, like the Baader MPCC corrector, the TS Maxfield coma corrector or the GPU corrector. For visual observation you need a 2" extension - item no. TSV235.

Pos. 2 - Astrophotography with the TS 2" Reducer/Corrector (shortest position)
The primary mirror is at the shortest position to the secondary. This version is optimized for the TS 0.73x reducer/corrector. The focal ratio changes from f/4 to f/2.92 due to the reducer.

Pos. 3 - Visual Observation and Paracorr - (longest position)
This version is for stargazers who want to use the telescope for visual observation. Also the 2" Paracorr VIP-2010 can work very well with this focus position. The focal ratio changes from f/4 to f/4.6.


Anti-reflective paint for maximum contrast
Our ONTC Newtons use the TS "Black" anti-reflective paint. It darkens the inside of the tube just as well as velour film. The big advantage besides a lighter weight is that the paint hardly attracts dust. The optics remain clean. With velour film, dust accumulates very quickly on the primary mirror.

The figure on the left shows how dark the anti-reflective paint is. The diagram (figure above) shows the direct comparison of school varnish / anti-reflective paint.

The 2" TS UNCN2 Crayford focuser:
A centerpiece of the TS ONTC Newtonians is the advanced TS UNCN2 focuser. The focuser builds up only 50 mm from the tube edge and still carries heavy cameras and accessories without tilting.

• high stiffness with extremely short length
• precise 1:10 micro-reduction - for perfectly focused astro images
• expandable with motor focus - with the TS motor focus advantage: manual adjustment possible with focuser attached
• screw connection of accessories possible - the focuser is already supplied with the 65 mm connection thread