I'm not really sure if this fits in here, so sorry if it's in the wrong forum.
This article is about future camera lenses that will be made using liquid. I'm not really sure how it works, but I gather from the article that the focus is adjusted using high-frequency sound, and the focus speed is around 4ms.
Read the article here: http://blogs.zdnet.com/emergingtech/?p=1051
Maybe our lenses will be replaced by these next time...