TS - Ritchey Chretien 16" f/8 - Optical Tube - Truss Tube
The TS 16" f/8 Ritchey Chretien Astrograph is a dream telescope for astrophotography. The scope is perfect for observatories.
The TS 16" 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 observatories and will be carried from mounts in the EQ8 class and bigger.
- Aperture 16" / 406 mm
- Focal Length 3250 mm
- Focal Ratio f/8
- Carbon truss tube with 2 Losmandy Level dovetail bars
- 99% dielectric high reflectivity 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
Teleskop Service has optimized this 16" RC especial for astro photography
The OTA comes with carbon trusses having a thermal expansion of nearly 0. The OTA weight is 42 kg and it has a Losmandy style dovetail rail on both sides.
Our 16" 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:
The TS RC has a generous back focus allowing to attach many accessories like off-axis guiders, filterwheels and much more. The distance from the tube backplate to the focus point is 306 mm.
To reach 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 Fiber Truss Tube Design:
Lightweight 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 regardless of the position of the telescope.
The 3" M-LRN Monorail Focuser:
The 3" Monorail focuser is a further development of the crayford design. The load is not carried by four (oten 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 evely 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
The hyperbolic primary and hyperbolic secondary are made from low expansion 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.
The RC telescope 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 separately)
A Fixed Primary Eliminates Image Shift:
Schmidt-Cassegrain, EHD, ACF... & Mak-Cassegrain telescopes achieve focus by moving the primary mirror back and forth inside the optical tube assembly, and this movement can cause image shift. While manufacturers have done a pretty good job of minimizing image shift 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:
This is also the advantage of RC telescopes against Celestron EHD or Meade ACF telescopes. These telescopes needs 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:
The TS Astrograph is a real Ritchey Chretien reflector telescope. Contrary to Maksutovs or Schmidt Cassegrains which have spherical mirrors and need image correctors, an contrary to Newtonians that need coma correctors, the RC system is a well corrected photographical instrument that unses only mirrors (no false colour!) and does not require any corrector with many cameras.
- 16" 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 16" Ritchey Chretien by TS with Carbon Fibre Truss Tube.