TS - Ritchey Chrétien 6'' f/9 Optical Tube

Most large professional telescope are constructed according to the RC principle. Until recently, these telescopes were unaffordable for amateurs. RC telescopes from Teleskop Service are primarily aimed to amateur astronomers with photographic interest. These telescopes are perfectly suited for high-resolution astrophotography. Of course, an RC can also be used for visual observing. Here, the large corrected field of view is noticeable, too. In total, the stars are sharper than, for example, in a Schmidt-Cassegrain.

The 6" f/9 Astrograph offers everything you will expect of a portable instrument for astro imaging. It is extremely portable and offers a superb image quality. Since the optical layout of the RC uses no lenses or corrector plates there is no false colour at all. Also you will not need to use an IR cut filter, thus increasing the effective light-gathering power of the instrument. The RC has a generous back focus allowing to attach many accessories like e.g. off axis guiders, filter wheels etc. If you want to take photos with a DSLR camera with the focuser in a moderate position, you need extension rings, we can offer you for your system.

The Astrograph is a real Ritchey Crétien reflector telescope. Contrary to Maksutovs or Schmidt Cassegrains which have spherical mirrors and need image correctors, and contrary to Newtonians that need coma correctors, the RC system is a well corrected photographical instrument hat uses only mirrors (no false colour!) and does not require any corrector with many cameras. The RC has a concave hyperbolical primary mirror and a convex hyperbolical secondary mirror. The resulting image correction throughout the field as well as the sharpness on the optical axis are superior to typical Schmidt-Cassegrains or Newtonians.

The primary mirror of the 6" RC is made of a very homogenous BK7 blank. Both primary and secondary feature a 99% high reflectivity coating which is well protected against scratches and against aging. Compared with similar instruments you get a much higher effective light gathering power. For a constant quality level each optical set is tested and hand corrected after the automatic production with state-of-the-art machinery. Then the optical set is tested with a Zygo interferometer.

Characteristics:

• Higher light power than 6" SC or 6" Mak systems
• 99% dielectric high-reflectivy coating
• High-quality 2" MONORAIL focuser with 2" and 1¼" adapter
• Larger fully illuminated field than a Celestron SC or Skywatcger Mak has
• Internal baffles in the tube for even more contrast
• Long back focus for correctors, reducers and also binoviewers

Delivery:

• 6" f/9 RC Astrograph OTA
• 2" focuser with adaptor 1¼"
• Dovetail - GP Level