Long exposure test with my new 1d MII. This was 55 minutes at f/7.1 using a tripod and shutter remote. I should of been using a wider aperture, but I had originally planned on doing a 120 minutes shot.
The 20D is supposed to be better and there is even a modified version of the 20D (20Da) that is better for night photography. The best thing to do, would be to take several shorter exposures and just stack the images together in photoshop.
I've been meaning to get a remote and try a bunch of longer exposure's (using the 300D), and I know if I shoot at 100 ISO for 30 seconds, it looks great, but then again, I've never tried anything over 2 minutes.
Excellent composition with the northern star and the star trails circling around it.
The roof/structure on the lower right corner disturbs the rural aspect of the treeline a bit, but I can pretty much live with it and it doesn't degrade the composition imho.
What is totally disturbing is the high amount of noise, though, even at such a low iso setting!
Kinda surprising to see that this is the result of a 1D Mark II...a highest class digital SLR.
Given a 55minute exposure, its not suprising to see noise. Noise is cumulative and grows.
The best approach would be to remove some noise by doing a dark frame subtraction, but that takes another 55 minutes to do (put the lens cap on, shoot a 55min exposure and then subtract the two frames).
Another approach would be to somehow activly cool the camera. Possibly set the camera up in an ice chest with a hole for the lens cut in it and put ice in the chest.
Without cooling, digital cameras just do not perform that well for extreme long exposures.