Camera field of view issues with lerp, DoTween, iTween etc.

Hi all,

I'm having an issue with smoothly moving the camera field of view in my game that I cannot resolve.

I have a script attached to the camera that follows the player, this checks if the player is within a certain distance to an object, if it is then the field of view zooms in, if it is not within a certain distance then the field of view zooms out.

In my code I have a list of objects and I iterate over each one to check the distance. The code does work, but the more objects I add to the list the less the field of view zooms in or out. I tried math.lerp, DoTween and iTween and I get the same issue with all of them so the issue is with how I've coded it.

Thanks in advance!

Here's my cameraFollow script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using DG.Tweening;
 
 public class CameraFollow : MonoBehaviour
 {
 
     public GameObject player;
 
     private GameObject launchPad;
     private GameObject tnt;
     private Camera cam;
 
 
     public float cameraHeight = 20f;
     public float offsetX = 0;
     public Vector3 pos;
 
     private float targetFOV = 25.0f;
     private float defaultFOV = 40.0f;
     //public float speed = 0.2f;
     public float distanceToBject = 10.0f;
     [SerializeField] float cameraZoomSpeed = 0.5f;
 
     List<GameObject> fovGroup = new List<GameObject>();
 
 
     // Use this for initialization
     void Start()
     {
 
 
         launchPad = GameObject.Find("Launchpad2");
         tnt = GameObject.Find("tnt_low");
         DOTween.SetTweensCapacity(2000, 50);
         cam = Camera.main;
 
 
         fovGroup.Add(launchPad);
         fovGroup.Add(tnt);
 
     }
 
     // Update is called once per frame
     void LateUpdate()
     {
         pos = player.transform.position;
         pos.x += offsetX;
         pos.z += cameraHeight;
         transform.position = pos;
 
         ZoomFOV();
 
     }
 
     private void ZoomFOV()
     {
         foreach (GameObject pickup in fovGroup)
         {
             if (pickup == null)
             {
                 return;
             }
             if (Vector3.Distance(pickup.transform.position, player.transform.position) <= distanceToBject)
             {
                 ZoomCameraIn();
             }
             else
             {
                 ZoomCameraOut();
             }
         }
     }
 
     private void ZoomCameraIn()
     {
         cam.DOFieldOfView(targetFOV, cameraZoomSpeed).SetEase(Ease.OutSine);
     }
 
     private void ZoomCameraOut()
     {
         cam.DOFieldOfView(defaultFOV, cameraZoomSpeed).SetEase(Ease.OutSine);
     }
 
 
 
 
 
 }