AudienceCamera.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AudienceCamera : MonoBehaviour
{
    public GameObject mainCameraEye;

    public bool lockZ = true;

    [Range(10f,0.5f)]
    public float positionLag = 3.0f;

    [Range(10f, 0.5f)]
    public float rotationLag = 2.0f;

    void LateUpdate()
    {
        Quaternion targetRot;
        Vector3 eulerRot = mainCameraEye.transform.localRotation.eulerAngles;
        if (lockZ)
        {
            eulerRot.z = 0.0f;
        }

        targetRot = Quaternion.Euler(eulerRot);

        transform.localPosition = Vector3.Slerp(transform.localPosition, mainCameraEye.transform.localPosition, positionLag * Time.unscaledDeltaTime);
        transform.localRotation = Quaternion.Slerp(transform.localRotation, targetRot, rotationLag * Time.unscaledDeltaTime);
    }
}