Focal length

EN: Focal plane shutter

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Shutter method that exposes the film to light by using a moving blind in the camera body.
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Focal length

Focal length is the distance between the focal point of a lens and the film plane when the lens is focused at infinity. It is used to designate the relative size and angle of view of a lens, expressed in millimeters (mm). A particular lens focal length (e.g. 35mm, 50mm, 105mm, 600mm, etc.) can generally be found engraved or printed on the front of the lens.

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Focal length magnification

Sometimes called FLM - See Format Factor below.

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Focal length multiplier or flm

See Format Factor below.

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Focal length:

The distance from the lens to the film plane or sensor that focuses light at infinity. The length, expressed in millimeters, is more useful as an indication of the angle of view of a particular lens. A shorter focal length lens, such as a 28mm, offers a wider angle of view than a longer one, such as 100mm.

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Focal plane

A camera s lens focuses light onto a specific plane where the film or sensor is located.

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Focal plane shutter

A camera shutter situated directly in front of the digital sensor or film, composed of an opaque curtain that contains a slit that moves directly across in front of the sensor or film, permitting light to strike the sensor or film. Some cameras employ two curtains.

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Focal point

(1) The central or principal point of focus. This generally refers to the main subject of your picture - the photograph s center of interest. Also known as the Center of focus. (2) The optical center of a lens when it is focused on infinity.

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Focal length

A lens’ angle of view. Such as Wide angle, standard or telephoto.

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Focal length

The distance from the optical center of a lens to the point at which parallel rays of light passing through it converge (the focal point).

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Focal length

Lens description, using millimeters (mm), the bigger the number, the longer the focal length of a lens, the greater the magnification of objects at a distance, e.g. 200mm, 400mm. The smaller the number, the shorter the focal length, the wider the angle of view, e.g. 14mm, 35mm. Security camera focal lengths commonly 1/4-, 1/3-, 1/2-inch.

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Focal length

Simply put, how wide or narrow a view the lens will provide, smaller numbers being wider and larger numbers being narrower.

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Focal length

The distance between the point of focus and the film plane when the lens is focused at infinity. Lenses generally have the focal length engraved on the front of the lens and is expressed in millimeters.

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Focal length

The distance betweenthe film and the optical center of the lens when the lens is focused on infinity.The focal length of the lens on most adjustable cameras is marked in millimetreson the lens mount. The distance from the principal point to the focal point. In 35mm-formatcameras, lenses with a focal length of approx. 50mm are called normal or standardlenses. Lenses with a focal length less than approx. 35mm are called wide angle lenses,and lenses with a focal length more than approx. 85mm are called telephoto lenses.Lenses which allow the user to continuously vary the focal length without changingfocus are called zoom lenses .

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Focal length

The distance from the optical center of a lens to the image plane when the lens is focused to infinity.

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Focal length

The distance from the optical center of the lens to the image sensor when the lens is focused on infinity, usually expressed in millimeters.

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Focal length

The distance from the principal point to the focal point.

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Focal length (camera lens)

The lens-to-focal-plane distance at the infinity setting. Focal length affects shooting distance, which affects Perspective. See: Angle of View.

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Focal length -

The distance from the focal point of a lens to the plane of the film (for viewers and cameramen, this is seen as the amount of area a lens can photograph from a given distance.).

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Focal length magnifier

Also known as Magnification Factor or Crop Factor, this term is used to describe the angle of view (AOV) of a lens used on a DSLR in relation to how it would appear on a full-frame 35mm camera. As an example, compact DSLRs contain sensors that are about 50% smaller than a standard 35mm frame. As a result, the effective focal length and AOV of a 50mm lens on a compact DSLR would be reduced, or cropped to the equivalent of a 75mm lens. Canon EOS Rebels and other compact Canon DSLRs have a 1.6x magnification factor, which would make a 50mm lens effectively an 80mm lens. For more on this subject, see the eplora article, ://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-crop-factor Understanding Crop Factor.

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Focal length multiplier

For a D-SLR that uses an imaging sensor smaller than full frame (35mm film frame), the ratio of the diagonal of the camera s imaging sensor in comparison to the diagonal of a 35mm frame is the crop factor. This ratio is commonly referred to as a focal length multiplier (FLM), since multiplying a lens focal length by the crop factor or FLM gives the focal length of a lens that would yield the same field of view if used on the reference format.

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Focal plane

The precise position (plane) within the camera body, behind the shutter curtain, at which the light gathering surface of the image sensor is fixed. In a film SLR, this is the same plane across which the film would be positioned for each exposure. The focal plane mark is a mark on the exterior of the camera body noting where the focal plane is located inside.

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Focal plane:

A plane parallel to your camera sensor that is in perfect focus.

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Focal point

A point on the optical axis where light rays converge to form a sharp image of an object.

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Focal length

The distance between the film and the optical center of the lens when the lens is focused on infinity. The focal length of the lens on most adjustable cameras ismarked in millimetres on the lens mount.

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Focal length

– An optical measurement that determines how much of what you see in front of you is captured by your camera s lens. A short focal length, such as 24mm, captures wide angle; a long focal length, such as 100mm, is telephoto. A normal focal length (50mm on a full-frame or film camera) roughly approximates how far away things appear to the naked eye. Focal length does not describe the physical size of the lens itself, but rather refers to its magnification.

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Focal length

Indicates the magnification and angle-of-view of a lens. The human eye sees things roughly the same as a 43mm focal length of a lens for a 35mm camera. Anything shorter is classed as a wide-angle, while longer focal lengths are telephoto. Because of the comparatively small size of the CCD in a compact digital camera it has a standard focal length of between 6mm and 8mm while a medium-format camera is around 80mm. .

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Focal length

When parallel light rays enter the lens parallel to the optical axis, the distance along the optical axis from the lens second principal point (rear principal point) to the focal point is called the focal length. In simpler terms, the focal length of a lens is the distance along the optical axis from the lens second principal point to the film plane when the lens is focused at infinity.

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Focal length range:

The run of focal lengths offered by a zoom lens. It s specified by the shortest and the longest, in millimeters--for example, 38–90mm.

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Focal length:

Technical term indicating how wide or narrow a section of a scene the lens includes in a picture (angle of view), and/or how big or small it makes the subject (magnification).

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Focal plane

Plane perpendicular to the optical axis at which an object at infinity is in focus.

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Focal plane

The area behind the lens where light is gathered to form a sharply-focused image. It s here where the film or CCD is placed. .

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Focal point, focus

When light rays enter a convex lens parallel to the optical axis, an ideal lens will converge all the light rays to a single point from which the rays again fan out in a cone shape. This point at which all rays converge is called the focal point. A familiar example of this is when a magnifying glass is used to focus the rays of the sun to a small circle on a piece of paper or other surface; the point at which the circle is smallest is the focal point. In optical terminology, a focal point is further classified as being the rear or image-side focal point if it is the point at which light rays from the subject converge on the film plane side of the lens. It is the front or object-side focal point if it is the point at which light rays entering the lens parallel to the optical axis from the film plane side converge on the object side of the lens.

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