Camera problem ,Unity 5

I am trying to fix errors in one of the scripts I transfered from Unity 4 to Unity 5:

Here it is:

    public var FOVIN : float = 35;
    
    public var FOVSpeed : float = 5;
    
    public var Aim : boolean = false;
    
    public var DeffFOV : float;
    
    public var Cam : Camera;
   
 function Start(){
 
 DeffFOV = GetComponent.Camera.fieldOfView;
 
 }
 
 function Update () {
 
 
 if( Input.GetMouseButtonDown(1)){ 
 
 Aim = true;
 
 }
 
 if( Input.GetMouseButtonUp(1)){
 
 Aim = false;
 
 }
 
 if( Aim){
 
 GetComponent.Camera.fieldOfView = Mathf.Lerp( GetComponent.Camera.fieldOfView, FOVIN, FOVSpeed * Time.deltaTime);
 
 
 }
 
 if( !Aim){
 
 GetComponent.Camera.fieldOfView = Mathf.Lerp( GetComponent.Camera.fieldOfView, DeffFOV, FOVSpeed * Time.deltaTime);
 
 }
 }

Its giving me problems with Camera part ,I am not sure I am using the "get component" right here ,I tryed the "GetComponent().fieldOfView" but it still gave errors ,this way I posted up in the code part lets me get into game mode but I get null reference error.... Help pls