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Fraser
2012-Feb-25, 03:40 PM
An accident at the Blanco 4m telescope at Chile’s Cerro Tololo Inter-American Observatory has severely damaged a secondary mirror. The telescope is currently shut down for installation of the highly anticipated Dark Energy Survey Camera, and on February 20, 2012, the telescope’s f/8 secondary mirror was dropped during testing, resulting in fractures in the glass [...]

More... (http://www.universetoday.com/93792/accident-damages-mirror-on-telescope-slated-for-dark-energy-camera/)

swampyankee
2012-Feb-25, 04:16 PM
Is the telescope completely unusable without the f/8 mirror or, with appropriate safety checks, are there limited operating modes that can be used?