135mm, 200mm, 300mm, 400mm, and 600mm. For these lengths many manufacturers produce two or more lenses with the same focal length but with different maximum apertures to suit the different needs of photographers. Additional focal lengths can be created by using a teleconverter. For 35 mm film and full frame digital cameras (in which the image area is 36 by 24 millimeters) prime lenses can be categorized by focal length as follows: 12 to 21 mm: Ultra-Wide — usually used at very close subject distances to produce a perspective that provides a dramatic, often extreme image that distorts a scene’s natural proportions 24 to 35 mm: Wide — capture a wider field of view than a standard lens, at shorter distances, the perspective can show distortion 50 mm: Standard — a focal length near the 44mm image diagonal and a perspective similar to human vision 85 mm: Portrait — short telephoto lens that accommodates a longer subject to camera distance for pleasing perspective effects and useful image framing 135 mm: Telephoto — used, for example, by action and sports photographers to capture faraway objects 200 to 500 mm: Super Telephoto — specialized, bulky lenses typically used in sports, action, and wildlife photography Specialist lenses Some specialist lenses are only available as prime lenses due to design or cost constraints. Examples of such specialist lenses are: extreme telephoto or wide angle, lenses with tilt or shift function, lenses with large apertures and macro lenses. References External links Photo Dictionary definition Photography Terms Photographic lenses