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I see Mike Lockwood, creator of the 14.5" f2.55 has just said:-
"The 14.5" shows that F/2.55 works, and now we know that a large scope at F/2.6 or slower will work too. A 30" F/2.8 is appealing, and imagine a 40" F/3. I am currently capable of working up to 50" mirrors, and up to 60" if I modify my large machine a little bit."
So we may see more prototypes and will see if some of the challenges that arise can be resolved.
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