In photography, the concept of focal length is closely tied to the field of view. The focal length of a lens directly influences the width of the scene that can be captured. Shorter focal lengths, as seen in wide-angle lenses, result in a broader field of view, while longer focal lengths, typical of telephoto lenses, narrow the perspective.

Wide-angle prime lenses have shorter focal lengths, resulting in a wider field of view. These lenses are ideal for capturing expansive landscapes or fitting more elements into a confined space. On the other hand, standard prime lenses typically have moderate focal lengths, providing a natural perspective that closely resembles human vision. They are versatile for various photographic genres.

Few years ago most of camera manufactures used camera lenses with normal lens and viewing angles for such lens could be calculated using usual ArcTan() formula.

Also for a proper lens selection you should consider both camera installation height and object height. Without taking all these parameters in the picture, the calculation error can exceed 30%.

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The only way to calculate the horizontal angle or field of view is to use manufacturer’s data and therefore tools with database of camera models, like IP Video System Design Tool show the correct result:

FOV tofocal length calculator

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DOF calculator

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fov和焦距的关系

Camera Field of View on 2D site plan (different colors represent camera zones with different pixel density): Calculating Field of View for cameras on the imported site map or floor plan.

Built-in camera FOV calculator displays the range of viewing angles for the selected wide angle camera with variofocal lens.

Avoid using commonly available online lens calculators because modern wide-angle cameras have non-standard wide angles (like 110 degrees instead of 85 degrees calculated by outdated Field of View calculators), and only a FOV calculator with a built-in database of camera models can show correct angles and calculate FOV precisely.

The focal length of a lens defines the AFOV. For a given sensor size, the shorter the focal length, the wider the AFOV. Additionally, the shorter the focal length of the lens, the shorter the distance needed to obtain the same FOV compared to a longer focal length lens. For a simple, thin convex lens, the focal length is the distance from the back surface of the lens to the plane of the image formed of an object placed infinitely far in front of the lens. From this definition, it can be shown that the AFOV of a lens is related to the focal length, where f is the focal length and H is the sensor size.

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CameraFOVcalculator

A fixed focal length lens, also known as a prime lens, is characterized by a specific, unchangeable focal length. Prime lenses are different from zoom lenses, as they do not offer variable focal lengths. These lenses are renowned for their optical quality and are often preferred for their ability to produce sharp images. Common fixed focal lengths include wide-angle primes, standard primes, and telephoto primes.

Understanding focal length is crucial in photography and optics, as it plays a pivotal role in determining how lenses focus or diverge light, influencing the field of view, perspective, and overall visual impact of images.

The focal length of a lens determines its ability to either focus or diverge light. A longer focal length indicates a gradual bending of light, while a shorter focal length implies sharper angles of light bending. Generally, lenses with positive focal lengths converge light, producing focused images, while lenses with negative focal lengths cause light to diverge. However, there may be exceptions, which are determined by the specific distance between the lens and the object being imaged.

Dfov hfov calculator

Aug 2, 2012 — Field number is the diameter of the eyepiece lens and is most often expressed in millimeters. Field of View (FOV) is the amount of the object ...

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Equivalent focal length calculator

Zoom lenses offer variable focal lengths, allowing photographers to adjust the magnification and field of view. This flexibility is advantageous in situations where changing lenses might be impractical or time-consuming. Zoom lenses come in various configurations, such as wide-angle zooms, standard zooms, and telephoto zooms, covering a range of focal lengths within a single lens.

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Understanding focal length is paramount in photography, influencing the composition, perspective, and overall visual impact of an image. Whether opting for fixed focal length lenses, such as primes with specific focal lengths, or embracing the versatility of zoom lenses with variable focal lengths, photographers can leverage these optical tools to achieve their desired creative outcomes.

For example for Hikvision DS-2CD2622FWD-I(Z)(S) the manufacturer has the following angle range specified: from 35 to 106 degrees. Ordinary lens calculators will give a wrong angle range, most likely: from 24 to 85 degrees.

A shorter focal length, such as those found in wide-angle lenses, results in sharper angles of light bending. This characteristic is essential for capturing expansive scenes, as it allows more of the surroundings to be included in the frame. Wide-angle lenses, with their shorter focal lengths, provide a broader field of view, enabling photographers to capture more of the environment in a single shot.

In everyday language the Field of View of Field of Vision, abbreviated as FOV, refers to that area which is visible through any optical instrument, which could be the human eye or a lens. This definition can be applied to the CCTV parlance and FOV can be defined as the width or height of a scene to be monitored by the security camera.  In CCTV Field of View depends on a number of factors such as the sensor format, the focal length of a lens, and the distance from the objects.

Telephoto lenses have longer focal lengths, allowing photographers to magnify distant subjects. These lenses are valuable for wildlife photography, sports events, and any situation where the subject is not easily approachable. Longer focal lengths compress the perspective, making distant objects appear closer and enhancing the details within the frame.

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It is very important to use the right lens for desired field of view; otherwise the images on security cameras will not be satisfactory. CCTV security camera lens with fixed focal length are less expensive and give smaller distortions but do not offer flexibility in terms of  field of view choices.

Here is the new 3D Online Lens Calculator with a built-in camera database. As a better alternative you can use IP Video System Design Tool, our professional CCTV design software. With that tool you can load a site map, add multiple cameras and see how modification of any installation parameter can affect the camera coverage.