TS - Ritchey Chretien 14" f/8 - Optical Tube - Truss Tube
The TS 14" f/8 Ritchey Chretien Astrograph is a dream telescope for astrophotography. The scope is perfect for small observatories.
The TS 14" f/8 Ritchey Chretien Truss Tube Astrograph is a true RC telescope and will give you spectacular photo results also with large format camera sensors.
The telescope is perfect for small observatories and will be carried from mounts in the EQ8 class.
Optimized for astrophotography
- Aperture 14" / 355 mm
- Focal Length 2854 mm
- Focal Ratio f/8
- Carbon truss tube with 2 Losmandy Level dovetail bars
- 99 % dielectric high - reflectivy coating on main and secondary mirror
- Big corrected flat field without need for additional correctors
- 3" Monorail Focuser with better stability
- Redesigned back plate, decoupling of the focuser from the telescope with seperate collimation
The OTA comes with carbon
trusses having a thermal expansion of nearly zero. The OTA weight is 30
kg and it has a Losmandy style dovetail rail on both sides.
The 14" f/8 RC Astrograph
illuminates a max. field diameter of approx. 70 mm. Without corrector,
35 mm are possible. In the latter configuration, you have a pure mirror
system without any lenses. You don´t need an IR cut filter and can use
the full spectrum with a suitable CCD camera.
How to find the focus
TS RC has a generous back focus allowing to attach many accessories
like off-axis guiders, filterwheels and much more. The distance from the
2" connection of the focuser to the focus point is 280 mm.
the perfect focus position, we suggest the GSRCV1172 and GSRCV1175
extension rings. The position of the rings is between focuser and tube
backside. So you always have a good position of the draw tube.
The Carbon Fibre Truss Tube Design
yet strong carbon fibre truss tubes have low thermal expansion
characteristics. Shifts in focus due to temperature changes are
minimized because of this design. The trusses are also designed to flex
equally, keeping the optics in collimation.
The 3" M-LRN Monorail Focuser
3" Monorail focuser is a further development of the Crayford design.
The load is not carried by four (often underdimensioned) ball bearings,
but on a stainless steel track on the base, thus preventing tilting and
bending even under high loads. It is countered by a big knurled screw
that centers the inner tube exactly to the rail. The load is distributed
evenly across the rail´s surface. Technical details of the focuser:
- Travel: ca. 80 mm
- Clear aperture: 68 mm
- Guidance: by massive and fixed steel rail
- 1:10 transmission for precise focusing
- 360° Rotation
- Adaption to 2" and (when screwed off) female M68 thread, directly fitting to TS 2.5" off axis guider
- For very heavy cameras, we offer an upgrade to a heavy focuser from
Starlight or to the rack and pinion focuser TSFOCR30S from TS Optics.
hyperbolic primary and hyperbolic secondary are made from low expansion
fused quartz, and finished with a scratch-resistant highly reflective
99 % dielectric coating for great contrast. The primary mirror is fixed
in place in a metal mirror cell, and the secondary resides in a metal
housing that can be collimated. The secondary mirror has a center mark
for easy and accurate collimation.
RC telescopes has three small cooling fans in the rear cell that help
create an ambient temperature within your telescope for more stable
viewing and less fluctuation in focus. The fans are powered by an
external battery pack. This battery holder accepts 8 AA batteries (sold
A Fixed Primary Eliminates Image Shift
EHD, ACF, and Mak-Cassegrain telescopes achieve focus by moving the
primary mirror back and forth inside the optical tube assembly, and this
movement can cause image shifts. While manufacturers have done a pretty
good job of minimizing image shifts on their telescopes, a moveable
mirror makes it almost impossible to eliminate it completely. The
Ritchey Chretien has a primary that is fixed in place, removing the
possibility of image shift and also the job of collimating the primary.
Why the RC Telescope is better than Schmidt-Cassegrain telescopes with correctors
is also the advantage of RC telescopes against Celestron EHD or Meade
ACF telescopes. These telescopes need a lens corrector which is
integrated in the optical system. The RC is a true reflection system
without lens corrector and with a really bright image.
The optical advantages of TS RC Ritchey Chretien Astrographs for astrophotography
TS Astrograph is a real Ritchey Chretien 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
that uses only mirrors (no false colour!) and does not require any
corrector with many cameras.
- 14" f/8 RC Astrograph with Truss Tube
- Losmandy Level Dovetail Rail on Bottom and Top
- Main Mirror Fan
- 3" Monorail Focuser with Adapter to 2" and 1,25"
High quality 14" Ritchey Chretien by TS with Carbon Fibre Truss Tube.