If we want a wideangle shot we want a wide field of view (say, 84 degrees horizontal). What we're really most interested in from a photographic viewpoint is the Field of View.
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It acts like a 160mm lens would on a full frame camera. It's still a 100mm focal length lens, but With a "1.6x" multiplier sensor has the same field of view on that camera as a 160mm lens would have when mounted on a full frame 35mm camera. For example, a 100mm focal length lens mounted on a digital camera Lens's focal length would have to be increased to give the same angle of view was the lens has on a digital sensor. Since the angle of view of a lens depends on both the focal length of the lens and the size of the image you can define a "digital multiplier", which is the factor by which a Rectangular frame, three fields of view are often given the horizontal FOV, the vertical FOV and the diagonal FOVĭigital multiplier: Digital multiplier is a term that's come into use with the increased use of digital cameras with a sensor smaller than the frame size of a 35mmĬamera. Since it depends on theįilm/sensor size it's not a fixed characteristic of a lens and it can only be stated if the size of the film or sensor it will be used with is known. It depends on two factors, the focal length of the lens (see above) and the physical size of the film or sensor. Recorded on the film or sensor in a camera. A 7mm focal length lens is always a 7mm focal length lens and a 300mm focal length lens is always a 300mm focal lengthįield of View: The field of view of a lens (sometimes called the angle of coverage or angle of view) is defined as the angle (in object space) over which objects are Remains the same no matter what camera the lens is mounted on. It's a primary physical characteristic of a lens which can be measured in an optical lab. This article is intended to try to clear up some of that confusion.įocal length: The focal length of a lens is defined as the distance from the optical center of a lens (or, the secondary principal point for a complex lens like aĬamera lens) to the focal point (sensor) when the lens is focused on an object at infinity. With the advent of digital cameras having non-standard sensor sizes there seems to be quite a lot of confusion concerning focal length, field of view and digital multipliers and how Left: Fisheye Right: Rectilinear conversion from fisheye Field of View - Rectilinear and Fishye Lenses
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