really really big ZOOM
 

damn, i got to use sigma 50-500 (~80-800 equiv) lens, its heavy..


just tested it-
Shot from my window (Ramat Gan, Israel) , my house is ~1.7km from that UC building..

>>
50mm ~25%
http://img252.imageshack.us/img252/1843/54725960ly4.jpg

500mm ~25&
http://img507.imageshack.us/img507/7199/31575125de4.jpg

500mm ~100%
http://img252.imageshack.us/img252/993/89096218wc3.jpg

500mm ~200&
http://img252.imageshack.us/img252/8531/23044003gw1.jpg

Neat how you can make out people on the construction site.

Cool, but everything's blurry :(

What was the shutter speed? You need 1/500 minimum to shoot at 500mm (unless you have a tripod).

There are also problems with photographing distant objects in high temperatures. Heat produces distortion in the air, and zooming in through it just magnifies the distortion. It looks like that was a problem here.