Field ofview camera

Jul 2, 2020 — Infrared can be used in cooking and heating food as it predominantly heats the opaque, absorbent objects, rather than the air around them.

The main advantage of the 940nm wavelength is that the IR LED’s do not produce any visible glow. In other words, they are completely invisible and can be used in applications that are required to be more covert. In fact, many people refer to them as ‘Covert IR’. This type of IR is also useful in places where a red glow may be mistaken as a signal and can not be used. The disadvantage of 940nm is that they are about 30-40% less effective and will illuminate less distance.

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As we mentioned above, humans FOV is about 170-180 degrees. Video game consoles’ field of view is typically around 60-70 degrees, which is a third of what you’d see in real life. And a PC sits at about 90 degrees. That makes a huge difference. Games that don’t adjust or allow for an FOV adjustment, really changes the whole game, literally. Many gamers find it very frustrating to play without that option.

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Field ofview Formula

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Whether you’re a photographer, videographer, or gamer, getting comfortable with field of view is essential to capture and experience the world around you.

Nothing will ever be as immersive as our own eyesight. When we look through a camera, each lens gives us a different angle that is always smaller than our field of vision.

IR technology has made great strides in recent years which is a great benefit to consumers and commercial CCTV users. SMART IR, Black Film Technology and STARVIS Sensors are among the exciting new Night Vision improvements in the surveillance industry. It is now possible to see extreme distances during day and night with high powered IR LED’s and IR Illuminators. If you are planning a CCTV Installation that requires night vision, it is certainly beneficial to understand the options that are available to you. At Ellipse Security, we are always ready to assist with your planning and design needs.

To go deeper into lens perspective, know the ins and outs of focal length. The next post explores wide-angle lenses, long-focus lenses, standard angle lenses, and creative uses of manipulating focal length. From compressing space to exaggerating movement, keep reading for more.

We’ll get into the specifics of FOV, including some examples and how it’s not the same as depth of field. Let’s start by answering the question, “What does FOV mean?”

In humans, the average field of view is about 170-180 degrees. This is often hard to accomplish through gaming or optical devices. The wider the field of view, the more one can see of that observable world.

“Although the IR light is invisible to the human eye, the IR LED’s will produce a faint red glow when looking directly at the camera or source.”

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But we can change lenses and get as close to the real thing as possible. Technology has become so advanced, we’re getting closer to the real thing.

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In photography, the question is not just about “what” you’re seeing in the image, “how much” you're seeing also matters. To understand the amount of image your camera can capture, you need to understand field of view.

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To add to that, 850nm and 940nm are equally invisible to the human eye, however LEDs put out a bell-curve of wavelengths (nothing’s perfect!) that can span more than 100nm. For a nominally 850nm consumer-grade LED, there is enough residual power in the visible red spectrum to see the glow. From 940nm the bell curve’s tails are too far gone by the time you get down into the 700s of nm, though with an extremely bright 940nm LED or one with a very broad spectrum, it might be visible. Most other light sources (incandescent filament bulbs, fluorescent, solar fusion) have messy spectra with numerous peaks all across the range, which is why things can look weird under the unnaturally precise (nearly-)single-color of LEDs unless multiple are combined to simulate natural light. (Hence “white” LEDs, though there is no such thing as a single white wavelength of light!) More precise LEDs can be had for specialty needs, but LASER is a whole nother level and can be spread over less than 1nm from its nominal color! And likely far more precise than that for crazy applications like particle physics.

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In photography, changing the field of view is possible simply by changing the lens. In order to capture more of a scene for instance, a wide angle lens might be used. While decreasing the field of view can be done by using a zoom lens or simply moving the camera, depending on what you’re trying to achieve. The smaller the focal length of the lens, the wider the angle or the wider the field of view. So when you change out lenses with varying focal lengths, your field of view will either widen or narrow.

Field of view is the extent of the observable world that is seen at a given time either through someone's eyes, on a display screen, or through the viewfinder on a camera. Field of view (FOV) also describes the angle through which one can see that observable world. It refers to the coverage of an entire area, rather than a fixed focal point.

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Field ofview human eye

Diffractive optics generate output patterns by means of interfering light waves, providing precise, customized patterns for a broad spectrum of.

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Focal length is measured in millimeters and it’s the given name of the lens. It’s the distance from the lens to the sensor. So if you’re shooting with an 8 mm lens, that means your sensor is 8 mm away from your lens. A short focal length like this, means a wider field of view. For more on the relationship between focal length and field of view, see below.

Whether you’re a photographer, a video game designer, a filmmaker, or work with VR, thoroughly understanding field of view or (FOV) is your foundation for success. It’s basic optics, and while you likely can assume what it is, let’s quickly go over it and see its importance in photography and the gaming world. So, what is field of view and why does it matter?

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There are two common IR wavelengths used in CCTV applications today. IR or Infrared wavelengths are measured in ‘nm’ or nanometers, which are used to specify the wavelength of electromagnetic radiation near the visible part of the light spectrum. Visible light ranges from about 390 to 700nm. The IR in CCTV applications take over from there, commonly 850nm and 940nm, which allow us to see images that would normally fall outside of our visible range, thus IR Illuminator. These CCTV IR LED’s are used to produce, or improve ‘Night Vision’ capabilities for security cameras.

In fact, technology like virtual reality uses a ton of camera equipment to give us a full immersive experience. The wider the field of view, the more realistic the experience.

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Although the IR wavelengths 850nm and 940nm, respectively, are fairly similar in performance, there are a few important differences worth noting. The use of IR LED’s in security cameras has become commonplace as technology has improved dramatically and cost has come down. Generally, the great majority of security cameras or CCTV Cameras are sensitive to the 850nm wavelength. Although the IR light is invisible to the human eye, the CCTV IR LED’s will produce a faint red glow when looking directly at the camera or source.

Most Security Cameras with built in IR LED’s, use an IR Cut Filter in order to maximize different lighting conditions during the day or night. During the daytime, the filter is on in order filter out Infrared Light, that way, color images are not distorted by IR Light. During the nighttime, the IR cut filter is automatically switched off to allow infrared light to enter the camera. The camera switches to IR Mode (Black and White) which is more sensitive to Infrared light.

The main issues with VR technology is the balancing act between needing thicker and heavier lenses that demand less focal distance to increase the field of view with lighter headsets and equipment that don’t cause color aberration and distortion quite like the heavier tech does.

When using a separate, or stand-alone IR Illuminator such as the LUMI-240 IR Illuminator , it is important to make sure your CCTV camera is sensitive to the same wavelength as emitted by the illuminator. In other words, if the illuminator is 850nm, your security camera must be sensitive to that wavelength. Most cameras are sensitive to 850nm. Security Cameras that are 940nm IR are available as well, but much less common.

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Other issues like motion sickness can even come into play, with a really low FOV. Although, I would argue if you’re getting motion sickness from video games, maybe you should get outside a bit.

Anyway, a larger field of view makes gaming more natural. If you can barely see your enemy before they get to you, it doesn’t really make for an enjoyable time.