Setting Player's Camera?

I am trying to set a player's camera to look at a certain point or far away from a part. Does anyone know how to do this?

I also tried this but I don't know if it just zooms the player's camera out, because it does nothing even when I changed it:

local cam = workspace.CurrentCamera
cam.Focus=CFrame.new(30,30,30)

Use CoordinateFrame instead. Just replace Focus and youll be fine :)