How to limit the mouse rotation?

Questions & Answers
1

public float sensivity = 7f;
public float mouseMax = 50f;
public float mouseMin = -50f;

void Update () {
	// look up & down
	float mouseY = Input.GetAxis ("Mouse Y");
	mouseY = Mathf.Clamp (mouseY, mouseMin, mouseMax);
	transform.Rotate (mouseY * sensivity, 0f, 0f);
}
2

I did some research:

your case:

 void Update () {
	// look up & down
	float mouseY = Input.GetAxis ("Mouse Y");
	transform.Rotate (mouseY * sensivity, 0f, 0f); // calculate new rotation
	 
	Vector3 currentRotation = transform.localRotation.eulerAngles; 
	currentRotation.y = Mathf.Clamp(currentRotation.y, mouseMin, mouseMax); // clamp y rotation
	transform.localRotation = Quaternion.Euler (currentRotation);
 }