I will shoot 2 - 3000 images per wedding and use a lot of SB900 multi flash setups in iTTL mode (D3 D300).
When the batteries go down the flash works fine in regular TTL mode but will fail in iTTL. So i will go through up to 7 sets a wedding - I just change them at regular intervals.
And now I run them in the bodies as well they are good for 3500+ frames. I was having a heap of battery issues as I like to shoot quickly and reliably on a wedding - the remote flash that stops is always the one one stuck up behind the organ.....
I bought a selection of batteries from http://www.thomas-distributing.com - conditioned them and tested times in my flashes. The Powerex under load were great. Next best were the Duracell 2650 then some other brands (Sanyo 2700 , Ansmann, Energizer, Maha ..... to name a few). Note I am only testing the top part of the batteries capacity.
The Powerex 2700 also had the most capacity when I tested them on the BC-900, even against higher rated batteries such as the Ansmann 2900.
Some batteries had such high internal resistance under load and heat that they would would cause the flash to shut down while the Powerex pumped.
Since I use a lot of batteries and will charge and condition my batteries low discharge has not crossed my mind to use low discharge types but of lot of you guys are.
Generally these guys are after long run times rather maintaining high voltage underload. These guys are really into batteries but not photographic images - there is a different demand in wedding photography .
Julian Meehan
Serendipity Media
Melbourne Malvern East
Apr 26, 2009 at 05:44 AM
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