Welcome to the forums!

Which camera brand?
I use an Opteka which is a rc remote on my D80. They make them for all the major brands I think and several here are using it. They are cheap on ebay...about 20; bucks.
Don't know if it is fast enough but you only have to point it in the general direction and can be used for up to 100 yards(claimed). I've used it at 50 or 60 yards. Helps if the batteries are fresh.