For Focal length we have terms and definitions in 8 topics. The topics are CCTV, Camcorder, Film, Photography, Professional Photography, Robotics, Telescope and Video.

Focal Length (CCTV)

The distance from the center of the lens to a plane at which point a sharp image of an object viewed at an infinite position. The focal length determines the size of the image and angle of FOV seen by the camera through the lens. This is the center of the lens to the image pickup device.

Focal Length (Camcorder)

Measured in millimeters or inches, this length refers to the distance between the center of the lens to the surface of the camera imaging device (CCD). Long focal lengths have small angles of view, while short focal lengths have wide angles of view.

Focal Length (Film)

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

Focal Length (Photography)

The distance, usually given in millimeters, between the optical center of a lens and the point at which rays of light from objects at infinity are brought to focus. In general, the greater the focal length, the smaller and more magnified the part of the scene, it includes in the picture frame.

Focal Length (Professional Photography)

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 is marked in millimeters on the lens mount.

Focal Length (Robotics)

The distance between the lens and the focal point. This is how far the light rays travel in order to converge, or come together.

Focal Length (Telescope)

The focal length of a thin, simple lens is the distance from the lens to the image it forms of an object that is very far away. For more complicated optical systems, the focal length generally does not correspond to any easily measurable distance. It is instead the focal length of a simple lens which would give the same size image of an object that is very far away.

Focal Length (Video)

The distance between the secondary principal point in the lens and the plane of the imaging device. The longer the focal length, the narrower is the angle of view.

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