How can I click/ pickup an object from afar?

Hi, I able to pick up an object close to the camera, but when the object a bit far from the camera, it won't let me pick it up / interact. I can pick it if I adjust the field of view in the camera setting during play. Need Help on this

 // I attach this into the camera
 using UnityEngine;
 using System.Collections;
 
 public class PickupObject : MonoBehaviour {
     GameObject camParent;
     bool carrying;
     GameObject carriedObject;
     public float distance;
     public float smooth;
     // Use this for initialization
     void Start () {
         camParent = GameObject.FindWithTag("MainCamera");
             }
     
     // Update is called once per frame
     void Update () {
         if(carrying) {
             carry(carriedObject);
             checkDrop();
             //rotateObject();
         } else {
             pickup();
         }
     }
     
     void rotateObject() {
         carriedObject.transform.Rotate(5,10,15);
     }
     
     void carry(GameObject o) {
         o.transform.position = Vector3.Lerp (o.transform.position, camParent.transform.position + camParent.transform.forward * distance, Time.deltaTime * smooth);
        
     }
 
     void pickup() {
         if(Input.GetMouseButtonDown(1) || (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved)) {
             int x = Screen.width / 4;
             int y = Screen.height / 9;
             
             Ray ray = camParent.GetComponent<Camera>().ScreenPointToRay(new Vector3(x,y));
             RaycastHit hit;
             if(Physics.Raycast(ray, out hit)) {
                 Pickupable p = hit.collider.GetComponent<Pickupable>();
                 if(p != null) {
                     carrying = true;
                     carriedObject = p.gameObject;
                     p.gameObject.GetComponent<Rigidbody>().isKinematic = true;
                 }
             }
         }
     }
     
     void checkDrop() {
         if(Input.GetMouseButtonDown(1)) {
             dropObject();
         }
     }
     
     void dropObject() {
         carrying = false;
         carriedObject.gameObject.GetComponent<Rigidbody>().isKinematic = false;
         carriedObject = null;
     }
 }
 
 
 
 
 
 // and this one into the object/marbles
 
 using UnityEngine;
 using System.Collections;
 
 public class Pickupable : MonoBehaviour {
      // Use this for initialization
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
 
     }
 }
 
 ![alt text][1]
 

[1]: /storage/temp/103520-123131.jpg