Focus a telescope without a mirror or lens

[mrsnipey]

Just saw this and thought it might be of interest.

http://space.newscientist.com/article/dn13820-telescope-could-focus-light-without-a-mirror-or-lens.html?feedId=online-news_rss20

[bindibadgi]

That's very interesting, but sheesh, if you thought a big refractor was long ...