In real estate photography, the term "crop factor" refers to the size of the sensor on a camera as it relates to a traditional 35mm (otherwise known as "full-frame") camera. This is important to know, as it helps photographers better understand how an image taken with a digital camera will compare to one taken with a traditional full-frame. Real estate photographers take the crop factor number of the camera and multiply it by the focal length of the lens. At that point, they can get the equivalent focal length of a 35mm film-based camera. This allows them to take images that are of the same high quality with digital-driven equipment.