ian.maw said:
"Adoption of a strong material to heat. Continuous emission number in comparison with the old model is a 50% increase. Battery Pack CP-E4N when using twice the continuous emission is possible."
This makes it sound like you can take many more shots before the speedlite overheats. This would be very welcome for myself and I am sure many others.
Yes, this seems an important change, perhaps the one difference in features that is really a major redisign. I ran into overheating problems with the 600 mark I a few times myself (but not very limiting to my needs).
I just wonder how a new and more powerful battery pack that charges the flash faster could lead to more flashes in a sequence before overheating occurs? That is a bit weird. (Almost as if the flash could fire a given amount of time until the temperature sensor sensed the temperature increase, and a faster recharging automatically results in more flashes that can be fired in that sensing-time, leading to a more severe overheating...
)
I also wonder if the new external battery pack can be used in the 600 mark 1 as well... (like the LP-E6N battery upgrade for the EOS bodies) and if, whether it also recharges the mark 1 flash quicker.
(I myself use JJC-FB1 external battery packs).