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Knaeble Engineering Pro Line 250mm Ritchey-Chrétien
Knaeble Engineering Pro Line 250mm Ritchey-Chrétien Weave/Design

Knaeble Engineering Pro Line 250mm Ritchey-Chrétien

Product Number: KE-RCM250FC/TI

Manufacturer: Knaeble Engineering
Contact us for accessories and additional details.
Pricing starts at $10,400.   
250 mm ultra Hi End Ritchey-Chrétien truss telescope. 

The truss frame is entirely built with mono directional high module carbon fiber tubes. The connection rings are fabricated with 6 mm high module carbon fiber plates cut with water-jet.

The primary mirror cell is a true technological jewel: 100% structural carbon fiber construction, 9 points computer optimized mechanical cushion, and zero thermal expansion. It is fully tiltable through 3 titanium bolts placed on the telescope's back plane. The cell's maximum deformations under the highest mechanical stress configuration (tube pointing at the zenith) are less than 0.03 mm. This value still improves with the optional Carbon/Titanium back plane.

With the secondary mirror assembly we created a mechanism of unmatched reliability, stability and lightness. The fully tiltable cell is fixed on a 16 mm rectified titanium bar, firmly held in position by a high precision axial linear ball bearing. The focus of the secondary mirror is easily adjustable through the bolt placed on top of the mechanism.

The dovetails are engineered with a Knaeble proprietary hybrid Aluminium-Carbon fiber construction (optional Titanium/Carbon). This type of design minimizes torsion deformation and structural misalignment under every pointing orientation. In comparison with traditional CNC aluminium dovetails, the deformations are reduced by a factor 40.

The back plane on all standard models is made of a solid, high module carbon fiber plate. It can host up to a 3,5" Feathertouch focuser with ca. 10 kg of equipment attached.The optional Titanium/Carbon design ensures an even higher strength.

Optics ................................................................................f/8 Ritchey-Chrétien
Optical quality ....................................................................1/8 Wave, 94%
Opening ............................................................................250 mm
Focal length .......................................................................2.000 mm
Mirror Substrate .................................................................Quartz optical set.
Focal length primary mirror .................................................750 mm (f/3)
Diameter primary mirror .....................................................250 mm
Diameter secondary mirror ..................................................105 mm
Diameter unvignetted field ...................................................40 mm
Focal extraction behind backplane ........................................ca. 220 mm
Mass (w/o focuser) ..............................................................ca. 14 kg
Length (w/o focuser) ............................................................737 mm

The connection ring between the OTA and the Focuser is fully tiltable

The structure of the telescope and the cell of the primary mirror are crafted in High Module Carbon Fiber (HMCF). For maximum stability, the connection components of the truss construction as well as the collimation bolts are in grade 5 titanium.

RC250 Spot Diagram
RC250 Matrix Spot Diagram


Included with scope delivery:
- Telescope RC FC/Ti
- Feathertouch 3,5” focuser
- Takahashi collimation scope
- 2 Carbon/Aluminum “Torsion Box” Losmandy 3” dovetail rails
- Carbon Fiber Dust Cover
- Flightcase

The following options are available:
- Field flattener, 68mm doublet (made in Germany), broadband coated 400-900nm, M68x1 connection, 100mm back focus
- Reducer/corrector 0.74x, 68mm triplet (made in Germany), broadband coated 400-700mn, M68x1 connection, 93mm backfocus
- Telescope thermal control unit, controls all temperature sensors, primary mirror fans, secondary heating and focusing system;  Ascom compatible, Ethernet or USB connection

NOTE ON SHIPPING COSTS - shipping costs are not included in the price listed and must be determined separately either before or after the purchase.

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