Optics

Current Sanderphil Ritchey-Chrétien astrograph

The actual OTA is a GSO Ritchey-Chrétien 8″ Carbon Fiber astrograph reflector.

Ritchey-Chrétien optics configuration is specially designed to provide a wide corrected field to medium and large sensors. That configuration tends to minimize the coma effects providing sharp and astrometric precise details even at the edges of the sensor.

This configuration allows us to balance in a better way (than with the Newton) the weights which are mounted on our mount resulting in a more accurate sky tracking and target pointing.

This configuration is especially designed to take pictures of the sky rather than for visual purposes for that it’s called an Astrograph.

The OTA details:

 
Focal Length: 1624mm
Aperture: 8″/203mm
Focal Ratio: f/8
Mirrors: low thermal expansion quartz primary and secondary mirrors
Reflectivity: 99%
Resolution: 0,57″
Tube Weight: 7.6 kg with focuser and dovetail bars
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