A:AnswerHello there, the Wired Universal Shutter does not list the Nikon D3300 to be one of the compatible models. The Nikon compatible models are the following: Nikon D1, D2, D3, D200, D300, D700, D800. -John Insignia Support.
A:AnswerThe best option I have found is going to be to just try the wired remote with your camera. Best Buy does offer a 15 day return policy so you would have the opportunity to return if it does not work.
A:AnswerIt will NOT work with a D7100 for sure. I just went and got this and when I got home and opened it, it doesn't have the adapter for a D7100. So, I would say no, it will not work for a D7000 b/c it doesn't have the correct adapter.