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Polarization can occur in two forms. Linear polarization where the electric field of light is confined to a single plane along the direction of propagation. Or circular polarization, where the electric field of the light consists of two linear components that are perpendicular to each other, equal in amplitude but have a phase difference of π/2. The resulting electric field rotates in a circle around the direction of propagation and, depending on the rotation direction, is called left- or right-hand circularly polarized light.

Have you ever been puzzled by different FOV angles when choosing the right conference camera for your conference room? Knowing more about FOV is necessary so you don't waste money on the wrong camera. This article will give you a comprehensive introduction to FOV and help you choose the best conference camera.

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When a polarizing sheet is placed in the path of light, only electric field components of the light parallel to the sheet’s polarizing direction are transmitted by the sheet; components perpendicular to the polarizing direction are absorbed. The light that emerges from a polarizing sheet is polarized parallel to the polarizing direction of the sheet.

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S-polarization vs p polarization

Now we can move on to choosing a suitable FOV for different use cases. Usually, it is related to how big your conference room is and the interior layout.

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At 108° FOV, we start to get into cameras which are considered "wide angle". Most huddle room cameras fall into this wide angle category. 108° FOV conference cameras provide 2.8 feet of view at 1 foot distance. This allows you to set up the camera on the long wall.

Electromagnetic waves are polarized if their electric field vectors are all in a single plane (linear polarization), or in 2 plans perpendicular to each other, equal in amplitude, but have a phase difference of π/2 (circular polarization).

Light waves from common sources (sunlight, halogen lighting, LED spotlights, and incandescent bulbs) are unpolarized, or polarized randomly.

In the Newtonian form of the lens equation, the distances from the focal length points to the object and image are used rather than the distances from the lens.

Linearpolarization example

If your conference room can hold 6-12 people, and most seats are facing the camera, a conference camera with a wider FOV angle such as 120° and even bigger would be better.

For a regular quadrilateral table, you need to know X (the distance from the camera to the table) and Y (half of length of the side facing the camera). Then calculate θ=arctan(y/x), and 2θ < camera HFOV.

FOV is just one feature you must consider when choosing video conference cameras, but it plays a big role. To determine what FOV angle is the best option, you will have to consider a number of factors, such as the conference table size, room layout, and how far away the table is to the camera. Check out all our conference cameras, and find the perfect one based on FOV.

• If the original light is initially unpolarized, the transmitted intensity I is half the original intensity. If the original light is initially polarized, the transmitted intensity depends on the angle θ.

At 90° FOV, you will get 2 feet of width for every 1 foot of distance from the camera. In this case, 10 feet will provide a vision of 20 feet across. This wider vision is suitable for a majority of conference rooms.

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For conference cameras, it refers to "what you see" through the camera lens. FOV is usually measured in Degrees. The camera is the single starting point, and the view radiates out and gets wider, forming a triangle.

Big conference rooms that can accommodate 12-16 people usually have a setup like this (pictured below). In this case, a 120° FOV may not be necessary. A FOV range of 60° to 90° is enough to get everyone in the camera frame.

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120° FOV, another common wide angle, is also a fit for huddle spaces. At one foot away, you get a vision of 3.4 feet across. At ten feet from the camera, that means 34 feet. This wide angle can almost get everyone within the camera frame.

As you can see, at one foot away from the camera, 72.5° FOV gives a vision of 1.4 feet across. It means that at 10 feet you get a vision of 14 feet across. A 72.5° FOV conference camera is a good choice for small conference rooms, with the conference room table at least 3 feet to 4 feet away from the camera.

Linearly polarized light

If your conference layout is none of the above types and you want to get down to a specific FOV angle that suits your needs the best, you will have to do some math.

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Now let's look directly at some popular FOV angles for conference cameras. To make it more clear how wide the view will be, we take one foot away from the camera as an example. This way, it's also easier to compare different FOV angles.

Linear polarisationformula

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If the original light is initially polarized, the transmitted intensity depends on the angle (θ )between the polarization direction of the original light and the polarizing direction of the sheet:

Linear polarisationmeaning

Field of view (FOV) is the open, observable area a person can see with their naked eyes or via an optical device, such as a camera. In other words, FOV is what you can see without turning your head. It includes what you see ahead of you and your peripheral vision.

Elliptical polarization

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If your conference room is relatively small, accommodating about 4 to 6 people, and the layout is as the following picture shows, a conference camera with an FOV range of 90° to 120° should be a nice choice. As people are quite close to each other, 90° to 120° FOV conference cameras assure that every one is in the camera frame.

Circular polarization

For an irregular oval table, you need to know X (the distance from the camera to the center point of the table) and Y (semi-major axis). Then calculate θ=arctan(y/x), and 2θ < camera HFOV.

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Linearly polarized electromagnetic wave

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• There is linear polarization (confined to a single plane) and circular polarization (two linear components that are perpendicular to each other.)

FOV angles can range from 54 degrees to 360 degrees. Bigger angles generally equates to a wider and better vision. But bigger is not always better and necessary. Different conference rooms and scenarios require different cameras, which is why there is so much variance when it comes to FOV.

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At 180° FOV, the camera provides wall to wall coverage. Basically, if you need total video coverage for your conference room, this is the solution you're looking for in cameras.