How can I use a perspective camera view instead of an ortographic camera view

I don´t know what to do, to have a perspective camera view that i can use to zoom in and out…

using System.Collections;
using UnityEngine;

public class PinchZoom : MonoBehaviour
{
public Camera mainCam;
public float perspectiveZoomSpeed = .5f;
public float orthoZoomSpeed = .5f;

void Update()
{
if (Input.touchCount == 2)
{
Touch touchZero = Input.GetTouch(0);
Touch touchOne = Input.GetTouch(1);

Vector2 touchZeroPrevPos = touchZero.position - touchZero.deltaPosition;
Vector2 touchOnePrevPos = touchOne.position - touchOne.deltaPosition;

float prevTouchDeltaMag = (touchZeroPrevPos - touchOnePrevPos).magnitude;
float touchDeltaMag = (touchZero.position - touchOne.position).magnitude;

float deltaMagnitudediff = prevTouchDeltaMag - touchDeltaMag;

if (GetComponent().orthographic)
{
GetComponent().orthographicSize += deltaMagnitudediff * orthoZoomSpeed;
GetComponent().orthographicSize = Mathf.Max(GetComponent().orthographicSize, .1f);
}
else
{
GetComponent().fieldOfView += deltaMagnitudediff * perspectiveZoomSpeed;
GetComponent().fieldOfView = Mathf.Clamp(GetComponent().fieldOfView, 20f, 89.9f);
}

}
}

}

What’s all of that code below your question? Are you using it? Does it work? It’s not actually zooming in and out, but squeezing the perspective tighter and wider is a similar effect.