More 600mm f/4
Canon EOS-5D Mark II - EF 600mm f/4 L IS USM - iso250 - f/8 1/2500 sec - Michael Grobe
Need to get one of these amazing Canon Tele lenses one day... love the 600mm, but the 500mm f/4 is substantially lighter and a bit smaller, so you can even hand hold it for a while. The 600mm is simply too heavy.
Canon EOS-5D Mark II - EF 600mm f/4 L IS USM - iso100 - f/5 1/800 sec - Michael Grobe
100% crop (actual pixels): the 600mm with the 5D Mark II reveal the heat distortion around the engines of a jet. Sometimes reality looks like a crazy bump map....
Canon EOS-5D Mark II - EF 600mm f/4 L IS USM - iso100 - f/5 1/800 sec - Michael Grobe
