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And other times it's purely circumstance. For example, I took this photo with my D300s + 70-300mm while in a kayak. This was the only time we had during that expedition that we were on the water and saw a pod surfacing of this size. Needless to say, I was machine gunning the crap out of this scene We also saw other wildlife and while in a kayak, it was admittedly a bit of spray and pray.
I guess the question is, would 3 FPS (which the D7100 can sustain with higher speed cards) really have resulted in not getting that shot? Or shooting half a dozen frames in rapid succession and then pausing to assess the scene and determine when the next best time to shoot a burst will be?
I'll be honest, I had reservations about the D7100 buffer depth but as I use it, I realize that the precious few times I utilized the deeper buffer depth of the D300, I was just taking more shots that I was going to have to delete later, my keeper rate wasn't going up. Now, I'm not saying that a smaller buffer is a "feature" - just that I think it's fairly uncommon for a sustained 3 FPS or a rapid 6-8 frame burst at 6 FPS to not be sufficient. There are some uses, of course, I just think most people (like myself) worry about that spec without a good reason.
Anyway. I posted the waveform of the D7100 shutter in a few modes here if you'd like to see what the FPS actually works out to when the buffer gets filled: