About a week ago I got a 1D Mark III and a 200 f2 IS from CPS since I had a cheer shoot last weekend and have another one coming up this weekend.
Both the camera and lens are nothing short of amazing. The lens I used last weekend for cheer and got really familiar with. I used one of their Mark IIn's for the shoot so I have yet to put the Mark III through its paces.
There hasn't been much I've shot with the setup otherwise so I took it out tonight to see what I could do in low-light, found the darkest place in the yard, and started doing some astrophotography.
This is a stacked image of the Orion Nebula, created from a bracketed series of images at ISO 1600, ISO 3200, and ISO 6400. It's a 100% crop from the Mark III and 200 f2 wide open.
It's amazing how quickly stars start to trail. At 100% and 200mm, you'll start seeing trails at less than a second in and to get a sharp shot off without trails, you're looking at ISO 6400 and f2, a wildly sensitive combination.
In any event, enjoy the photo. =)