Excerpt: I was doing a big conference and knew I would only have about 4 shots for each group of billionaires at the most...so one miss fire or slow recycle and a lost chance for a good shot...so I purchased the CP-E4 for that sole purpose...
It is light and I put it on my belt.
Excerpt: I was unhappy with the recycle time for my Canon 580 EX II flash used as daylight fill flash for bird photography. I decided to go with the Canon battery pack over the knockoffs because of quality issues and the much more expensive and powerful accessory batteries because I read reviews on how they...
Excerpt: This unit increases usability of the flash and shortens recycle times, as noted elsewhere. My problem is that this is the exact same unit that I have been purchasing for half the price as model number SF-18 from a retailer named after a famous river.
Excerpt: This is a really nice lightweight compact addistional power source. Easy to carry. The only drawback is the tray that holds the batteries. There are little plastic tabs that break off when you replace the battereies no matter how careful you are.
Excerpt: It's durable and increases the flash recycle very significantly. I can't image going without this pack now that I've used it. I'll be getting more of these. I'm a little dissatisfied with the price but it is a very good product.
Excerpt: The limiting factor with flash seems to be the heat buildup on the strobe, itself. Having this external pack certainly gives you more battery life, but the main reason that I bought it was so that I wouldn't *literally* fry my flash unit when shooting wedding receptions.
Cons: Batteries Fall Out Easily, Bulky, Cord Too Short, Difficult to Use