Internal focusing (IF)

Internal focusing (IF)

System in which only the internal lens group shifts during focusing. IF benefits include focusing without changing the physical length of a lens body, faster focusing, reduced diameter of the focusing ring, closer minimum focusing distance, and aberrations corrected throughout the entire focusing distance range.

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Industry/Domain: Photography
Category: Professional photography
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Related terms

internal focusing (IF)

Photography; Professional photography

system in which only the internal lens group shifts during focusing. IF benefits include focusing without changing the physical length of a lens body, faster focusing, reduced ...

internal focusing system

Photography; Professional photography

A focusing method that divides the lens system into front, middle (internal), and rear groups and focuses by moving only the middle group.

focusing

Engineering; Electronic engineering

Bringing a ray of particles or energy to a common point. This can be done using lenses, deflecting coils, deflecting plates, or reflecting devices. Focusing can be done with ...

focusing

Photography; Professional photography

system of moving the lens in relation to the image plane so as to obtain the required degree of sharpness of the film.

focusing

Science; General science

(in animal physiology) The process of directing and concentrating light from a source onto the retina of the eye, by means of the lens, in order to obtain a clear image of objects ...

rubber lens-mount gasket

Photography; Professional photography

A flexible rubber gasket that forms a seal between the lens and the camera body.

subject-to-camera distance information

Photography; Professional photography

The data supplied to the camera by the lens indicating the distance from the camera to the subject. This information makes possible advances like 3D Color Matrix Metering II and ...

vignetting

Photography; Professional photography

A loss of brightness or saturation at the periphery of an image; usually not desired, but sometimes used to create a vignette framing the subject at the center of the image.

special effects mode

Photography; Professional photography

A mode in which the user can create artistic results simply by adding special effects to still images and movies. To select an effect, the user rotates the mode dial to EFFECTS ...

still picture

Photography; Professional photography

A photograph (static image) as opposed to a movie (moving picture).

stop-motion

Photography; Professional photography

Generic term for an animation technique which makes static objects appear to move. This is done by recording each movement of the object as an individual frame, when each frame ...