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The History and Development of the ESO Active Optics System
R.N. Wilson
Abstract
The active optics system is the fundamental optical characteristic of the ESO New Tech
nology Telescope (NTT) and Very Large Telescope (VLT). The NTT pioneered this system.
Without it, the VLT, with its thin, very flexible mirror, could not give a usable
optical image at all.
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