Annoying noise from Nissin Flash
I've found the high voltage output 1.6 V batteries are quiet. Just a brief second of noise and it's gone. Eneloops are worst as the noise is continuous.
Guess the high out batteries are the solution for now as it seems to be a normal operating way for this. I'm writing to Nissin also to request they fix this someday as the noise, especially w Eneloops is distracting enough to effect concentration and is notice by people standing nearby.
In every other way I'm very happy with this flash.