Giant Magellan Telescope-spun mirror query

**nytecam[_1_]** · #1 October 3rd 05, 12:15 AM

Visited Mt Hopkins MMT in the 1980s and read the GMT at http://www.gmto.org/ will mimic this 7 mirror cluster principle but focus directly to a single point via 6 off-axis surrounding mirrors.

How are off-axis 8.4m mirrors spuncast? I understand the principle for on-axis casting but what sort of turntable needed for off-axis spinning? I'm guessing 26m [= final scope diameter!] or am I missing something?

Nytecam

#2 October 3rd 05, 02:58 PM

Google up Roger Angel and/or the Mirror Lab at University of Arizona

#3 October 3rd 05, 06:37 PM

Try this:

http://uanews.org/cgi-bin/WebObjects...rticleID=11355

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