field of view
Definition
Noun The angular or spatial extent of the observable world that is visible at any given moment through a device (like a camera, telescope, or microscope) or to the naked eye.
Usage
The term "field of view" (often abbreviated as FOV) is used to describe the visible area or breadth of a scene. It is a technical term common in optics, photography, astronomy, and virtual reality. * The wider the field of view, the more you can see from side to side. * The narrower the field of view, the more zoomed-in or focused the view is.
Examples
- The security camera has a field of view of 120 degrees, covering the entire parking lot.
- The astronomer adjusted the telescope to widen its field of view and capture more of the nebula.
- In this virtual reality headset, the immersive experience is enhanced by a very wide field of view.
- The sniper's scope has a very narrow field of view for precise targeting.
Advanced Usage
- Field of Regard: This is a related but distinct concept. While "field of view" is what is visible at a single, fixed moment, "field of regard" refers to the total area that can be observed by moving the optical device or one's eyes.
- Instantaneous Field of View (IFOV): A more precise measurement used in remote sensing and scanning systems, referring to the angular field of view of a single detector element at a given instant.
Variants and Related Words
- FOV: The common abbreviation for "field of view."
- Angle of view: A closely related term often used interchangeably in photography, though it technically refers to the angle through which the imaging device can see, which determines the field of view at a specific distance.
- Visual field: The term used in medicine and physiology for the total area that can be seen by the eye when it is fixated on a central point.
Synonyms
- Sightline
- Vista (in a more general, non-technical sense)
- Scope of vision
Related Phrases
- In/Within one's field of view: Located where it can be seen.
- Keep the suspect within your field of view at all times.
- Out of/Outside one's field of view: Not located where it can be seen.
- The bird flew outside my field of view before I could focus the binoculars.
Noun
-
the area that is visible (as through an optical instrument)
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