as described above may have a wide field of view and improve optical performance through aberration improvement the optical system according to exemplary embodiments may satisfy conditional expression 1 the optical system according to exemplary embodiments may satisfy conditional expression 2 here fov is the field of view of the optical system and ttl is a distance from the object side surface of the first lens to an imaging surface of the image sensor the optical system according to exemplary embodiments may satisfy conditional expression 3 here ttl is the distance from the object side surface of the first lens to the imaging surface of the image sensor and f is an overall focal length of the optical system the optical system according to exemplary embodiments may satisfy conditional expression 4 here f 1 is a focal length of the first lens and f is the overall focal length of the optical system the optical system according to exemplary embodiments may satisfy conditional expression 5 here f 2 is a focal length of the second lens and f is the overall focal length of the optical system the optical system according to exemplary embodiments may satisfy conditional expression 6 here f 3 is a focal length of the third lens and f is the overall focal length of the optical system the optical system according.