I setup my vivitar 285HV and tested the PowerGenix NiZn Batteries along with the Sanyo Eneloops 2000 mAh AA batteries and the Sanyo 2700 mAh AA batteries. Check the video for the results of the recycle time on the flash.

http://www.youtube.com/watch?v=v54CN6pB2uA --link to video
Bascially the NiZn were a bit faster in recycle times but werent far behind the other two
JTP

http://www.youtube.com/watch?v=v54CN6pB2uA --link to video
Bascially the NiZn were a bit faster in recycle times but werent far behind the other two
JTP