I am trying to buy a external battery for my Nikon D7100, but there are many variations on the net and I am confused about which one is good to buy. Does Nikon make an external battery grip or do I have to get a third party one?
They make the MB-D15
I have one of these and love it. The challenge/benefit with third party ones are:
Challenges: Can be lower quality. Check out reviews. Generally people like Photix grip.
Benefits: Lower cost.
The Nikon one is not cheap:
But since this is the kind of thing that you will use for the life of your camera, it's worth considering paying the extra price for the Nikon model. That would be my choice although with something like a grip you're probably pretty safe w third party.
D7100 too small for your hands wow! I'm 6'4 and it feels pretty big to me :)