Thanks for sharing these. I'm impressed and pleasantly surprised the N5 did this well. Fireworks are difficult to photograph well, even with a high-end DSLR in hand. I agree with +Mike Martins
the N5's shutter is very slow for any given exposure, and you can see that with the fireworks. Though, to be honest, this is better than I expected. Good autofocus with that much smoke in the air is virtually impossible, anyway, so we can't really fault the N5 for that. Well done. Great experiment.