The secondary ring is an electro-mechanical system that supports and manipulates the Cassegrain mirror high above the primary mirror. It is the highest component on the OSS at zenith position. It consists of 4 ring sections, 8 vanes and 4 vane end actuators. The system allows for active optics to fine tune the focus of the telescope for best image resolution and clarity.
Secondary ring being positioned for installation onto the OSS.
Martin Diaz, Larry Carr and Terry King presiding.
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1) Secondary ring approaching the OSS support beams ever so slowly. Notice the vane end actuators are pre-mounted
2) Two of four vane end actuators
3) Close up of Cassegrain vane cantilever's
4) Cassegrain mirror mount. This is the item that is suspended above the large primary mirror
and mounted to the secondary ring with precision vanes.
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