RNT-EM is a very versatile telescope, suitable for all observation and research needs that occur during the activity of a professional or advanced amateur observatory: the great stability and precision mechanical manufacture ensures high photographic or digital imaging level, while the 4 to 6 focal points lead to a very easy and useful method on visual observation. By means the TELMARD system (a secondary mirror on axis rotation system, manually or electrically controlled by a pc), you can quick redirect the focal point to the different focusing tubes, equipped at the same time for visual observation, photographic and digital imaging or electronic detection (spectroscopes, photometers, etc.), since a ricollimation is not needed at all. The optical tube is a Serrurier type, with adjustable trusses that allows the perfect aligning of top with the bottom side of the scope. The original trusses set is interchangeable with sets (optional) having different lengths in way to vary the focal relief point.

As you can see from the above table, the theorical resolution of motion drives encoders is far superior to which of axis encoders; this fact is due to the de-multiplier effect of coupling-ratio between the motor drive and the telescope axis encoders. This situation is a useful way to ensure a smooth and precise R.A. and Dec. axis movements, but it tends to sum various errors, included the unavoidable worm and wheel coupling error; so, the priority for getting the value of the angular position of the telescope is given to the encoders fixed on R.A. and Dec. axis.

The lower image shows the upper side of an RNT-EM example suited simultaneously with a CCD for deep sky imaging, a WebCam for high resolution planetary snapshots, a binocular viewer and a standard eyepiece for visual observation. The secondary mirror rotation is hand or electronically (as shown) done, choosing by a PC the focuser we want redirect the focal point.

The primary mirror is housed into a cell provided by several floating point type supports on the bottom, and special featuring side supports that allows to preserve the optical quality at each position of the scope tube. The centre of the cell is provided by a cooling fan that allows a fast reaching of the working temperature to the parabolic mirror. As optional we can provide a thermo-mechanical actuator system, to compensate thermal expansion of the primary mirror,and to keep it in axial position at any working temperature .
All versions are provided by a hidden channel system, that allows the housing of either the control and the electronic imaging and detection systems cables; it avoids an external mess of cables.

At lower left, a moment of the R.A. axis shaping; this component is a fundamental part for the whole telescope stability, so it's generously sized. At lower right is shown one of the two declination half-axis; they are adjustable, so they are driven in perfect coaxial position while assembling the scope. Being exposed to atmospheric agents, they are stainless steel made.

The Basic Control System consists of an automatic go-to system, controlled by a pc, for driving of R.A. and Dec. DC-servo motors

The Advanced Control System consists of an automatic go-to system fully controlled by a PC; it allows the drives motion of:
- A.R. and Dec. Brushless motors
- two or four motorized focusers for an automatic focusing
- on axis secondary mirror rotation system (TELMARD)
- system for opening and closing the telescope tube
- opening and closing the dome of the observatory
- rotation of the dome
Plus some kinds of acoustic signal for scope motion and forced stop under emergency status.