TS-Optics 8 inch f/8 Ritchey-Chrétien Astrograph Telescope with EQ5 Mount
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 equatorial mount EQ5
The equatorial mount EQ5 carries the RC telescope with very good stability for visual observation and astrophotography. The mount comes with a sturdy stainless steel tripod, which can be extended up to 140 cm height.
The mount can be upgraded from the polar finder, through motor controls to the complete GoTo control with autoguiding connection. This makes the EQ5 the ideal base for astrophotography.The advantages of the TS-Optics RC Telescopes at a glance
Astrophotography with the RC telescope
Hyperbolic primary and secondary mirror for a large fully illuminated field of view.
- Astrophotography with camera sensors up to 30 mm diameter
possible without corrector. For larger sensors, like full-frame size,
Teleskop-Service offers ready-to-use corrector solutions.
- 99% dielectric high-reflectivy coating on main and secondary mirror for an even brighter image.
- Significantly shorter cooling down time through open construction and active primary mirror ventilation.
- Internal baffles in the tube for even more contrast.
- High back focus for correctors, reducers and also binoviewers.
- High-quality 2" MONORAIL focuser with 2" and 1.25" receptacle.
Due to the large corrected field of view, you can, for example, use a
DSLR up to APS-C format without corrector. Thus the RC is a pure mirror
system for astrophotography. The images become ultrasharp. For imaging
directly in the focus, you will need the M90x1 extension tubes which are
supplied. They are threaded between telescope and focuser, thus
The generous back-focus also allows attaching correctors which we
recommend when using sensors of at least full-frame size. You can also
attach a focal reducer, thus further increasing the speed of the RC.
You can connect the camera directly via 2" receptacle.
The 2" MONORAIL focuser
The Monorail focuser combines the ease of movement of a Crayford
focuser with the stiffness of a rack-and-pinion focuser. Thus
astrophotography becomes a success.
Primary and secondary mirror of quartz glass
Massive stainless steel rail instead of small ball bearings for more stiffness.
- No tilting anymore when locking the drawtube.
- 360° rotation for optimal object alignment
- Female M69x1 thread for threaded adaptions
- 2" and 1.25" compression rings for push adaptions
- 1:10 dual speed for accurate focusing
- Motor focus can easily retrofitted
- Lined scale for quick retrieving of the focus.
- Easy operation
Quartz glass does not change its dimensions if temperature changes. When
the temperature changes slowly during an exposure, other mirror
substrates, like Pyrex, tend to a deformation of the mirror and thus to a
shift of the focus. This problem does not exist for mirrors of quartz
glass. Thus the focus is better maintained which is very important for
long exposures. Both mirrors are coated with 99% reflectivity. The image
is obviously brighter than the one of telescopes with only 90% or 94%
The advantages for astrophotography
The TS RC astrograph are true Ritchey-Chrétien telescopes. Maksutovs and
Schmidt-Cassegrains have spherical mirrors and need correctors for
making a large field usable. With Schmidt-Cassegrains, you can see the
aberrations in the field even when working visually. Most times,
Maksutov-Cassegrains are so slow that they are not suitable for
astrophotography. RC telescopes have hyperbolical primary and secondary
mirrors. They are more difficult to manufacture, but offer a
significantly sharper field with less aberrations throughout the field.
Advantages to Schmidt-Cassegrain telescopes with correctors
Celestron EHD or Meade ACF telescopes need a corrector.
Additionally, these telescopes have a Schmidt plate at the front side
which is prone to dew. The RC is a pure reflection system without lenses
in the light path. Thus you can use the complete light even in the
infrared range. The image is brighter and the exposure times get
shorter. The field of an RC telescope is coma-free by design and
relatively flat. No shifting problem
Telescopes with focusing via movable primary mirror often suffer
from the "shifting problem". The image shifts while focusing or even
jumps. By now, Meade and Celestron have the problem under control, but
the effect is noticeable nonetheless. TS RC telescopes do not have this
problem, as their primary mirror is fixed. Focusing is done via a
high-quality focuser. An additional advantage is the optimal distance
from primary to secondary mirror. This gives you the guarantee of the
best possible image. If the primary mirror moves relatively to the
secondary, you will practically never have the optimal distance.
- 8" f/8 RC Astrograph
- 2" Focuser with 1:10 Micro Transmission
- Reduction from 2" to 1.25"
- 2x Dovetails - GP Level
- Skywatcher EQ5 mount
- Stainless Steel Tripod
- 2x counterweight
A really affordable RC Telescope with premium features for amateur astronomer who is into serious deep space imaging.