Image taken with camera at the same location, with same focal length, but using shift instead of rotating the camera. Notice that we no longer suffer from perspective distortion.

Fieldofview human eye

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Camerafieldofview simulator

The Field of View (or just short 'FOV') of a camera describes how much of the scene is visible from the camera, or how "wide" or "zoomed-in" the view appears, and as a consequence, how large or small objects appear in the frame. FOV is measured in degrees, horizontally and vertically. Larger FOV values indicate that more of the scene is visible and therefore objects will appear smaller, whereas smaller values mean less of the scene is visible and objects will appear larger.

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FOVto focal length calculator

Image taken by rotating the camera up to capture the full height of the subjects. Notice the significant perspective distortion.

With brightness levels in simulation configurations of up to 5,400 lumens, the FS70-4K6 is one of the brightest single-chip DLP projectors on the market with 4K UHD resolution. Features especially designed for simulation include Smear Reduction Processing (SRPTM), dual input WQXGA @120HZ (4K UHD @60Hz), dual iris and optical filters for better contrast and higher black levels, as well as optics purpose designed for NVG stimulation.

Focal Length = 50mm – Camera moved farther from subjects to make the green/yellow cylinder roughly the same size in the frame as in the previous image. Notice that the red cylinder is now much large relative to the green/yellow cylinder.

The FS70 is designed for performance and reliability. With the Constant Light Output functionality, the projector produces predictable and constant brightness and color over an extended period of time. And thanks to Barco’s unique and proprietary Single Step Processing (SSP®) technology, all image processing for 4K UHD − including warp, blend, gamma and color − is calculated in a single operation. Performing this procedure in just a single step produces a much higher overall image quality, with a sharper image, fewer artifacts and less latency. The design of the FS70-4K6 also takes into account the mounting requirements and suite of lenses − making the FS70 series the perfect choice for technology upgrade decisions.

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In most consumer cameras, the lens is centered on the imaging plane (film back or sensor). However some professional cameras include the ability to adjust the offset of the lens with respect to the sensor. This lens offset is usually referred to a shift. Shift can be used to maintain a certain perspective while changing the composition of the image, or more commonly, to correct for the natural perspective distortion that occurs when photographing a building or other large structure from the ground.

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Lens Formula: The focal length calculation is based on the lens formula, which states that the reciprocal of the focal length. is equal to the sum of the ...

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The Focal Length of a camera, usually measured in millimeters, is the distance from the film or sensor back to the optical center of the lens. There is a direct (non-linear) relationship between focal length and FOV. Longer focal lengths result in narrower FOVs, while shorter focal lengths result in wider FOVs. There is a direct linear relationship between focal length and the apparent size of the subject in the frame. For example, doubling the focal length will make the subject twice as large in the frame.

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The relationship between focal length and FOV depends on the physical size of the film or sensor onto which the image is projected (Sensor Size (Film Gate)). For 35mm film cameras or so-called "full frame" digital cameras, this size is 36mm x 24mm. For such cameras, commonly used focal lengths are:

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The FS70-4K6 is a laser-phosphor projector with native WQXGA and up to 4K UHD resolution that was built specifically for simulation applications. This dedicated IR projector is the answer to the simulation market's specific requirements - including high robustness, longer lifetime, and laser-sharp image quality. It also allows for full individual control of visual and IR intensity to stimulate NVGs with IR transmission at 740nm. Dual iris and optical filters ensure better contrast and higher black levels.

Fitted with a protective metal that encases the entire projector, Barco’s FS70 is robust enough to withstand a motion platform's rapid and sudden movements, making it the perfect choice for this type of application. With a lifetime of up to 60,000 hours (depending on the mode of operation), the FS70 is one of the most durable projectors on the market today.

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_Focal Length = 24mm – Focal length changed, no camera movement. Notice the red cylinder still ½ the height of the green/yellow cylinder, but more of the background is exposed._

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Changing the focal length or FOV is only one way to control the size of an object in the frame ("zooming in" or "zooming out"). The other way is to actually move the camera closer or farther away from the subject. Note that these are not equivalent and will result in very different looks. While the focal length/FOV changes the size of a single object in the frame, the relative sizes of 2 objects in the scene depends ONLY on the location of the camera relative to these objects. Thus framing a scene with multiple subjects involves positioning the camera to achieve the desired blocking and relative sizes of the subjects, THEN adjusting the Focal Length to achieve the desired overall framing. In the following example, the two cylinders in the scene are the same height (10). We position the camera such that the red cylinder is approximately ½ the size of the green/yellow cylinder. We then show the effect of first making the focal length wider and of moving the camera

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