That_Fox wrote in post #9998007
I have both the 40D and the 7D, the ISO performance really isn't that much better. I'd say maybe 2/3 stop better, during typical usage I try to stay at or below ISO 1600 on the 40D while on the 7D I'll try to do about the same but will use ISO 3200 when I'm in desperate need of light. Don't expect miracles out of it, but it is better. (I have gotten usable ISO 6400 shots before, but you really have to nail the exposure for that.)
I think the consensus has been right about 1 stop, if not a bit better, starting at ISO 3200 (which is where the 40D stops) and up. I have shot at ISO 6400 with the 40D pretty often (Raw/EC-1/+1 manipulation), and the differences are very noticeable between the two.Gallery Link
Here is a shot at a high ISO that the 40D would have never captured this cleanly. Sure it was post processed, but I did so many high ISO tests with my previous 40Ds (had 3 or so) with the same post processing actions, and I know from experience it would not have handled the shot this well. At this point, most of the detail after noise reduction would have been completely muddied on the 40D. I will say that the low ISO of the 40D is on par or better, due to what Canon did to the 7D to wring higher ISO performance out of it. They definitely took away a bit of the low ISO luster to add to the high ISO performance, or at least I am in agreement with others on that regard.
- 200+ pics all at ISO 6400 or 12800Another Gallery Link
- all ISO 6400 I believe, it's been a while