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Gotta have at least 1 spare battery, I usauly dont need it but if it dies while your diving you will be very XXssed off, so just put in the spare b-fore you get in the water and you will not have a worry in the world!!!
This is a must have lense, I took a shot of a rainbow above water and cpouldnt get the whole thing in fram without it. Also underwater it helps with large fish up close.