Ritchey Chretien

The TS 10" f/8 Ritchey-Chrétien Astrograph is a dream telescope for astrophotography.

• Aperture 10" / 250 mm
• Focal length 2000 mm
• Focal ratio f/8
• Hyperbolic primary and secondary mirror for very high sharpness on the optical axis and a large well-corrected field for astrophotography
• Mirrors made of fused silica for stable focus position
• 94% enhanced reflectivity on main and secondary mirror for an even brighter image
• Quicker cooling down thanks to open construction and primary mirror ventilation
• Two Losmandy style dovetail bars supplied - ideal for accessories like guiding scopes or a piggyback camera mount
• Carbon truss tube - more rigidity and better focus stability for astrophotography
• 3" MONORAIL focuser with M77x0.75 female thread on the extension tube and M74x0.75 male thread connection and 2" / 1.25" reduction adapter
• Extension tubes for the focuser (2x 25 mm, 1x 50 mm) are supplied (image at left)
• RC correctors for larger sensors are optionally available
• New! Primary mirror and the M117 connector for the focuser are decoupled from each other. The focuser can be adjusted (tilted) independently from the primary mirror.

Ritchey Chretien astrograph with 250 mm aperture with corrector and fast focal ratio of f/6.4 for astrophotography with sensors up to full frame format

• Aperture 250 mm / focal length 1625.5 mm / focal ratio f/6.4
• High quality 3" rack and pinion focuser with internal corrector and 360° rotation - everything is screwed together
• Primary mirror and secondary mirror made of quartz glass for stable focus position
• 94% enhanced reflectivity on primary mirror and secondary mirror for a bright image and short exposure times
• Carbon truss tube with high quality workmanship for optimal stiffness and focus stability
• Working distances 55 mm from M48x0.75 thread (adapter included) and 73.7 mm from M68x1 thread for individual adaptations
• Two Losmandy style dovetail bars for adapting to mounts and attaching optional accessories such as guiding scope
• The focuser can be tilted independently from the primary mirror (tilting)
• Ventilation of the primary mirror accelerates cooling down
• Extensive accessories like 2" connection for observation, extension rings between focuser and telescope, finder shoe on the tube ...
• Each RC is checked and optimized by TS/APM before shipping. It is provided with a checklist.