Astro-Tech AT6RC Ritchey-Chrétien astrograph includes 1 inch and 2 inch spacers and Crayford dual speed focuser. Condition is excellent comes with original packing.
FEATURES:
• 6" f/9 true Ritchey-Chrétien hyperbolic mirror optical design
• diffraction-limited or better BK-7 mirrors• enhanced aluminium optical coatings, overcoated with quartz
• dual-speed 2" Crayford focuser
• 1" and 2" extension rings for fine-tuning the back focus
• Vixen-style dovetail rail
