Depth of field and F-number

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Difference between Depth of field and F-number

Depth of field vs. F-number

In optics, particularly as it relates to film and photography, the optical phenomenon known as depth of field (DOF), is the distance about the Plane of Focus (POF) where objects appear acceptably sharp in an image. The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil.

Angle of view

In photography, angle of view (AOV) describes the angular extent of a given scene that is imaged by a camera.

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Aperture

In optics, an aperture is a hole or an opening through which light travels.

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Bokeh

In photography, bokeh (— also sometimes pronounced as) is the aesthetic quality of the blur produced in the out-of-focus parts of an image produced by a lens.

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Circle of confusion

In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source.

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Diffraction

--> Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit.

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Entrance pupil

In an optical system, the entrance pupil is the optical image of the physical aperture stop, as 'seen' through the front of the lens system.

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Film format

A film format is a technical definition of a set of standard characteristics regarding image capture on photographic film, for either stills or filmmaking.

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Focal length

The focal length of an optical system is a measure of how strongly the system converges or diverges light.

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Illuminance

In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

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Macro photography

Macro photography (or photomacrography or macrography, and sometimes macrophotography), is extreme close-up photography, usually of very small subjects and living organisms like insects, in which the size of the subject in the photograph is greater than life size (though macrophotography technically refers to the art of making very large photographs).

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Magnification

Magnification is the process of enlarging the appearance, not physical size, of something.

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Moritz von Rohr

Moritz von Rohr (4 April 1868 – 20 June 1940) was an optical scientist at Carl Zeiss in Jena, Germany.

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Numerical aperture

In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.

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Optical aberration

Aberration in optics refers to a defect in a lens such that light is not focused to a point, but is spread out over some region of space, and hence an image formed by a lens with aberration is blurred or distorted, with the nature of the distortion depending on the type of aberration.

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Optics

Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it.

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Pupil magnification

The pupil magnification of an optical system is the ratio of the diameter of the exit pupil to the diameter of the entrance pupil.

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