What exactly is Dark Frame Subtraction? How and when do you turn it off?
From what little I could get from my searching, it is something you want to turn off in the camera for long exposures and has to do with reducing noise (but I could be off here)
Several questions come to mind:
At what point is an exposure considered "long" --1 sec, 2 sec, 3 minutes?
Why exactly do you want to turn it off during a long exposure? Does it negatively impact the quality of the photo? What if you leave it on?
I have both the K100D and the K200D. I think I can turn off DFS...assuming I knew how to do it and why I should
thanks!
sue