Smove look at controler

So im trying to make a camera system where you look at an object and orbit around it and run smoothly this is my code

Code (csharp):

1.  
2.     GameObject target;
3.  
4.     void Start(){
5.         target = GameObject.Find("Player");
6.     }
7.  
8.     void Update(){
9.         this.transform.LookAt (target.transform.position);
10.         transform.RotateAround (target.transform.position, new Vector3(Input.GetAxis("Mouse Y"), Input.GetAxis("Mouse X"), 0), 150 *              Time.deltaTime);
11.     }
12.  
13.  

im trying to get it to not flixer when you look some directions and to be apple to zoom in and out of the object

 

BTW i already read ever answer and forum post about this subject and i still got nowhere, ive been working on this for 3 hours new

 

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