Do you know what this is??

Question

I want to know the name of the thing that can connect to your camera and you just press a button that is in your hand for the picture to be taken. Can you get them for all cameras?? Are they worth getting??

Answer 1

I think you are asking about a remote shutter release ... there are three types and you need to choose the right one based upon which camera you have.  

There are cable releases which work on all the older SLR's and some DSLR's like the Nikon D100.  There are remote releases attached to a cord that plug into a fitting on cameras (like the Nikon D200's and newer) with a trigger and locking mechanism.  There are remote releases that use IR to communicate with the camera.

You may find it easier to take your camera into a camera store and have them see which you need

The reason I use them is to prevent camera movement when shooting at slow shutter speeds.