# Focal

The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., ...

A focal length equivalent to 28mm on a 35mm camera is often considered ideal for landscape photography because it covers a relatively wide angle of vi...

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In optics, 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 ("c...

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For a given f -number, increasing the magnification, either by moving closer to the subject or using a lens of greater focal length, decreases the DOF...

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The Focal Length controls the amount of zoom, i.e. the amount of the scene which is visible all at once. Longer focal lengths result in a smaller FOV ...