On Jan 21, 2:04*pm, bildan wrote:
http://www.newscientist.com/blogs/on...lephoto-lens-s...

Yes! It's always struck me that a little signal processing on the
shimmer you see in telephoto lenses might work to show thermals.
A bit of signal processing would also show birds, gliders, cornstalks,
cu development, and other stuff that the naked eye tends to miss.
Darn day job...

John Cochrane