Below you can check out a new Canon 7D short movie, shot with a 70-200 f.40L, a 50mm 1.8, and a 10-24mm Tamron. What's quite interesting about it is that it comes in two parts - the first one was shot during the day and the second during the night, in the dark. It means that you can see what's the camera's low light performance, but on the other hand Ahmed Elhusseiny, the author of the video, provides some information (via DSLR Shooter):
 

"I love my 7D dearly but there were times when I was shooting at night that I would have sold an arm and a leg (preferably not my own) for a 5D mkII with better low-light performance. First to be sacrificed to the light sensitivity gods was the 60fps I had been shooting at. I needed every split second of shutter speed so it was down to 24fps. Next was going wide open when I could, and when I needed more than a few hairs’ width of depth of field I had to crank up the ISO all the way to 6400 on some shots. This obviously resulted in a lot of noise and a surprising amount of compression artifacting."

Ahmed had to run the night shots through Neat Video’s denoise plug-in for After Effects and he admits that he was amazed by the results.

If you want to read Ahmeds' article, make sure to follow this link.

Source: http://www.dslrnewsshooter.com