hi! i just bought my first dslr (d300) a few months ago and i absolutely love it! but, when i use my pop up flash as commander to my sb600 (remote) i cannot fire consecutive releases. i have to wait a second before firing again - i push the shutter, but nothing happens. does anyone know if it is my camera battery that is taking the time to recycle (i always use a freshly charged battery) or my flash. i'm trying to figure out if i need to by the extra battery pack for the camera, a pocket wizard, or a quantum - hopefully not all of them! thanks so much!