Ritchey-Chretien telescopes are popular for astrophotography and professional observatories due to their relatively large corrected field and absence of coma.
The tube assembly is semi-ruggedised and is of fail-safe construction.
The mirror supports in instruments under 600 mm are high precision floatation cells with full edge supports, larger mirrors are supported with kinematic face and edge supports.
The focuser is included as standard, this is achieved by moving the secondary mirror.
This model is available up to 1M Aperture. Please enquire for details.
Aperture (mm) 250
Recommended mount type GEM
Tube tube Closed
Focal length (mm) 1500
Tube length (operating) 625
OTA Weight (kg) 12
Back focus 175
Focal ratio F/ 6
Cooling fans Primary mirror
Mirror coatings Enhanced Aluminium + SiO2 protective layer
Focuser Integrated JTW Rhino
Clear aperture (mm) 50
Tube construction Carbon fiber
Optical surface quality (Strehl, PTV) 0.97, 1/10
Primary mirror substrate Schott Supremax 33
Primary mirror cell 9 point floatation cell
Primary baffle Solid with micro-baffling
Secondary mirror substrate Schott Supremax 33
Secondary mirror cell 3 point floatation cell
Secondary baffle Solid with micro-baffling
Bolting A4 Stainless steel
Metal protection Dual
Surface treatment Aluminium – 20 micron hard-coat anodising
Paint Exterior grade powdercoat (environmentally friendly)
Anti dew system Optional