24mm f/4.0 ISO6400 205 x 10s = 34.2 minutes total 2015 Feb 9
Canon 5D2 on fixed tripod
Another example using the 50mm lens on a fixed tripod.
Notice that the stars have various colours. That is because they are different temperatures. The naked eye does not see the colours because we lose colour sensitivity in the dark. The camera is not affected in that way.