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It also gives you another shutter button which makes taking vertical photos more comfortable as well as another speed dial, you also have AE lock but the main thing is you can run the camera on standard batteries or on one or two of the li-lon batteries or plug in mains power all at extra cost mind.
but on the down side it adds a lot of weight to the camera, the other option is just buy a spare battery, however running it with two li-ion batteries seems to last foe ages.
You have to work out if you really need it.
Robster
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