I bought the external battery pack for the 540 flash. It's the unit made by Pentax that takes six C-cells. I forget the designation, but it's easy to find at B&H. I thought I was going to shoot some weddings, but hadn't done so until now. Today, I finally did. I shot about 700 frames, at least half of them flash. The pack held out right to the end, and it was only in the final few shots that I noticed that recycling had slowed. Very good. I like it. Paul
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