Camera Zooming

I think this is the proper place for this question…

I want to zoom my camera out a little bit during an animation scene. Aside from moving it, what other method is there? Do I just change the focal point, or do I also have to deal with distance concerns?

I see a little input box under Depth of Field in the Camera Properties window that accepts an object for defining the depth of field focal point. Do I use this to direct the camera to always use a specified object as the focal point?

I want to zoom my camera out a little bit during an animation scene. Aside from moving it, what other method is there? Do I just change the focal point, or do I also have to deal with distance concerns?
What concerns ? Keyframe the camera focal length to zoom the camera as you would with a real camera

I see a little input box under Depth of Field in the Camera Properties window that accepts an object for defining the depth of field focal point. Do I use this to direct the camera to always use a specified object as the focal point?
You can do it you want to use depth of field