>Quick question. I've been doing quite a bit of night >photography, and I'm somewhat frustrated by the fact that if I >take a 30s exposure, it then seems to take 30s to write to the >card. If I were to upgrade and use an XQD card, will this >dramatically improve, or is that merely for the speed in >downloading, or the buffering capacity for rapid bursts?
It's not buffering or card, it is "long exposure noise reduction". It does a dark frame exposure of the same length as the exposure itself.
You might read the thread below that's just been updated: