Panoramic photography is a technique of photography, using specialised equipment or software, that captures images with elongated fields of view. It is sometimes known as wide format photography. The term has also been applied to a photograph that is cropped to a relatively wide aspect ratio. While there is no formal division between "wide-angle" and "panoramic" photography, "wide angle" normally refers to a type of lens, but this lens type does not necessarily image a panorama. An image made with an ultra wide angle fisheye lenscovering the normal film frame of 1:1.33 is not automatically considered to be a panorama. An image showing a field of view approximating, or greater than, that of the human eye - about 160° by 75° - may be termed panoramic. This generally means it has an aspect ratio of 2:1 or larger, the image being at least twice as wide as its height. The resulting images take the form of a wide strip. Some panoramic images have aspect ratios of 4:1 and sometimes 10:1, covering fields of view of up to 360 degrees. Both the aspect ratio and coverage of field are important factors in defining a true panoramic image.