This product is no longer stocked and therefore cannot be purchased until further notice.
Product no.: 55122
The Omegon RC 355mm truss-tube astrograph is an instrument that will find itself at home in a medium to large observatory. The optics provide an excellent and coma-free image. Thanks to the open design, the truss-tube quickly adapts to the ambient temperature and also holds collimation extremely well. The massive EQ-8 mount can carry up to 50 kilograms and is an ideal base for successful astronomy photos.
Omegon RC carbon-fibre truss-tube telescope - professional astrophotography for your observatory
If astrophotography is your passion and you are looking for exactly the right telescope for your observatory, then a Richey-Chretien telescopes is ideal. Their large mirror optics produce a nearly perfect image. The two hyperbolic mirrors provide a large, well-illuminated and coma-free image from the compact design. The result - perfect stellar images right out to the edge of the field of view. That is also the reason why countless professional observatories and institutes swear by this system.
Now you can use this professional technology for your own observatory too! Omegon RC telescopes are so well-balanced that they can be accommodated in even smaller observatories.
The advantages in a nutshell
Hyperbolic mirror for a better image
RC telescopes have hyperbolic main and secondary mirrors. They do not use spherical mirrors, such as in Schmidt-Cassegrain systems. As a result, the RC design is clearly superior - the optics provide a significantly wider image field with considerably less imaging aberrations.
A very high image quality over a wide field of view - that is the purpose of these telescopes. That is why they are always the first choice for astrophotography. This is the reason why RC systems are the right choice for large CCD cameras. This means that your photos are sharp right out to the edge of the field of view, even without using a corrector, to create beautiful photos of the night sky.
More usable in an extended spectral range
RC telescopes have no lenses in the beam path. This is a big advantage! As a result, problems with refraction effects - such as chromatic aberration or dispersion - do not arise. The usable range of the spectrum beyond the visible light is greater, allowing you to also use your camera to penetrate the UV and infrared ranges - which are often very interesting.
Quartz main mirror
You have probably experienced this yourself if you are an experienced astrophotographer - focus drift during long exposures. This is extremely annoying! The advantage with this model is its two quartz mirrors - these undergo virtually no thermal expansion and so provide not just a fantastic image but, once focused, will remain focused for the entire night.
Get started observing faster - main mirror fan
Just a quiet, unobtrusive hum, but what an effect! - the built-in 12V fan means 50% faster cool-down of your main mirror. This allows your telescope to reach optimum image quality more rapidly, so you do not have to wait for so long.
Carbon-fibre truss-tube design OTA
Most professional telescopes use a truss-tube design and this telescope enjoys exactly the same advantages. The carbon-fibre tubes are stiff, light and especially thermally stable - another reason why there is no focus drift. Natural ventilation is better with a truss-tube design and prevents the system from developing its own microclimate.
Large unobstructed aperture: 3” focuser
The back end is especially important: the bearing-mounted 3” Linear Crayford Focuser gives you enough space to illuminate even large format image fields without vignetting.
A hybrid of Crayford and guide rail offers you the effortlessness of a Crayford focuser with the stability of a good rack and pinion focuser.
Focuser can be independently aligned
Six collimating screws allow you to precisely align the 3" focuser with respect to the mirror optics, thus ensuring the following - no slipping, the eyepiece or your camera sits on the optical axis. The focuser even has a genuine 3" diameter - this should not to be taken for granted, as many similar focusers taper off toward the eyepiece end.
A better image than an SC telescope
To start with, an RC telescope is completely different to the classic SC or Maksutov design. It has no corrector plate and is hence an open system that adapts faster to the ambient temperature than an SC telescope. The absence of a front corrector plate also means that the telescope provides brighter images with no risk of internal reflections. Ritchey-Chretien systems are the most highly corrected two-mirror telescopes available. Their edge-to-edge image sharpness is impressive, so it is no wonder that practically all large research telescopes use this design of telescope in their professional observatories.
Making hyperbolic mirrors is both a science and an art. Up to only a few years ago, RC telescopes were among the most expensive telescopes in the world - only international institutions used them for research. But this technology is also now also affordable for experienced amateur astronomers.
Included in delivery
EXTRA HEAVY-DUTY COMPUTERISED GO-TO EQUATORIAL MOUNT
The Sky-Watcher EQ8 is an exciting new extra heavy-duty, observatory class German equatorial mount, with a payload capacity of up to 50kg. Quiet in operation, the EQ8 is supplied with the Synscan Go-To handset and can automatically find and track over 42,900 celestial objects from its extensive computer database.
Available either complete with pier tripod or as the mount head only, to install onto a static pier. Two 10kg counterweights and the Synscan handset are supplied with both options.
A great feature of the EQ8 is the patented dual-encoder technology. Auxiliary encoders are located on both the R.A. and DEC. axes. This allows the telescope to be moved manually, by releasing the clutches, or electronically in either axis without the mount losing its alignment or positional information. After moving to a new object, the mount will continue to track it accurately. This gives the user enormous freedom, convenience and flexibility during observational sessions.
Permanent Periodic Error Correction (PPEC)
The EQ8 is equipped with an index on its R.A. worm. After a proper PEC training routine, in which the training data is stored in the motor controller permanently, the user can start the PEC training at any time to improve its tracking performance for short focal length astrophotography. A training process is not required in the next observing session, assuming the polar alignment is always accurate, thus this is a permanent periodic error correction (PPEC), and the user can train the mount for manual guiding or auto-guiding.
The EQ8 is equipped with two home position sensors. Working with the Synscan hand controller, the mount can be placed to the same home position after turning on the power.
Batch Exposure Function
The EQ8 is equipped with a SNAP port which can control the shutter release of a camera. Working with the Synscan handset’s ‘Camera Control’ function, a user can take batch exposures when doing astrophotography. Up to 8 groups of ‘exposure times & frame’ combinations can be set on the Synscan handset.
6" Losmandy-style mounting plate
Safely attach telescope optical accessories with Farpoint Bread Board Style Dovetail Plate. Machined of sturdy aluminum with a black anodized finish, this bread board style dovetail plate is a 6″ long multi-purpose “D” size dovetail. 1/4-20 tapped holes and 1/4-20 through holes. Losmandy compatible.