Hi, Im looking for a Speedlight for my Nikon camera since I do portrait photography, but I cant afford the really expensive SB-800s and so on, so I looked around and found the Yongnuo YN-565EX. However, it said "for Nikon SB-800, SB-900, etc". Does this mean it has to be the slave for an SB-800 or such? Or can I use it on the camera on its own. Thanks
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