Here’s how to calculate field of view: FOV = 2 * arctan (S / 2f) Where S is the size of the sensor (diagonal size in millimeters) and f is the focal length of the lens (also in millimeters).

Speaking of magnification, another important concept to understand when looking at field of view is field size or how much of the subject and background are visible in your camera’s field of view.

The most important thing to remember is that shorter focal lengths have a larger angle of view. Conversely, longer focal lengths will have a narrower angle of view. This holds true for both prime lenses and zoom lenses.

Say you want to know field of view of a 35mm lens mounted on an FX body, find the “Lens Focal Length” column and look down to the row marked “35mm” and then over to the green area 35mm & FX-format cameras.

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Humans have binocular vision, meaning that we see with two eyes, not just one. This allows us to have a fairly wide field of view: 180 degrees, give or take a few degrees of peripheral vision.

This chart covers the focal lengths of normal, rectilinear camera lenses. Fisheye FOV is a bit different. | Credit: Nikonians (Click to Enlarge)

One thing to keep in mind is that inside your camera we’re actually working with circular images. Because your sensor is a rectangle, it captures the rectilinear portion of this cone. That rectangle comprises your field of view.

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FOVto focal length calculator

Remember, not all camera manufacturers use the same sensor size when they refer to “full-frame” or “crop sensor,” so the numbers will usually be slightly different when using other brands.

Using the image above and the magic of trigonometry, we can calculate the overall field of view with the equation below:

Wide-angle lenses will expand a perspective, providing a larger field size. Telephoto lenses will compress a perspective, thereby magnifying the subject.

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For example, a 200mm lens will enlarge objects 2x more than a 100mm lens does and 4x more than a 50 mm lens does. The field size is the reciprocal, in this case, either 1/2 or 1/4 of the dimension.

For an image with a “natural” look – one without a lot of distortion or magnification – the FOV offered by a 50mm or even an 85mm lens will do the trick. In fact, 85mm prime lenses are favorites of many portrait photographers.

For a 50mm lens on an APS-C/DX sensor, the FOV comes out to 26.3 degrees horizontally, 17.7 degrees vertically and 31.4 degrees diagonally.

For example, shorter lens focal lengths (i.e. 16mm, 24mm, and 35mm) have a larger angular field of view, hence the term “wide-angle” lens.

Since 35mm film cameras were the norm back in the day, that’s the visual field all digital cameras are compared to. Full-frame sensors are more-or-less the same size as what was 35mm film.

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The overall field of view is the maximum area your sensor can capture at a given lens focal length of a lens. It’s the lens focal length combined with the size of your camera’s sensor that determines the camera field of view. It is easy to figure out what is field of view of the camera by knowing the focal length.

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The answer is simple: sensor size and lens focal length. Distance from your subject (i.e. “zooming with your feet”) may look like it’s affecting your field of view, but it’s not really changing the angle of view inside your lens.

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Please note that all of these images were taken on a full-frame camera. Crop-sensor cameras will have a smaller angular field of view using the same focal length.

FOVfull form

Smaller sensors capture a smaller portion of the image cone and therefore have a smaller FOV than a full-frame sensor camera. A medium format camera, having a larger sensor, will have a larger FOV than a full-frame.

A closer look shows us that the angle of view is actually the angle between any light captured on the horizontal dimension, and any light captured at the edge. (The red lines mark the edge.)

The field of view for a 35mm Nikon lens turns out to have a horizontal FOV of 54.5 degrees, 37.8 degrees of vertical range, and 63.4 degrees diagonally. This is the maximum area your camera can “see.”

If you’re always shooting with the same sensor (i.e. the same camera), then the main thing that will change your field of view is the lens and what lens focal length you choose to use.

This will vary depending on the size of your camera sensor, but in general, the field of view of a 24mm lens will be somewhere around 84 degrees for full-frames, and 61 degrees for crop sensors.

These lenses also tend to have a level of distortion that needs to be addressed in post-processing, but they capture a large amount of the scene in front of them.

Unsurprisingly, many beginner photographers only think about focal length when they go to purchase a new camera lens. In reality, field of view is actually what’s guiding their decision.

FOVmeaning

Here you can see how the 135mm telephoto lens has the narrowest angular field of view at 12 degrees. A 35mm lens has a considerably larger conical visual field with a 46-degree FOV. A focal length of 16mm in with a FOV of 84 degrees.

The angle of view is the angular size of the view cone. (See diagram above.) You might also see it referred to as the angular field of view.

The more experience you get with different lenses and shooting in different environments, the more intuitive the relationship between field of view and lens focal length will become.

Many things in this world go hand-in hand: cookies and cream, peanut butter and jelly, bagels and salmon… In the photography world, we’ve got field of view and lens focal length.

The math behind field of view in photography is a tricky topic, but understanding the concept is pretty simple. This guide breaks it down for you the easy way!

Focal length, on the other hand, is the same regardless of sensor size – it will always be the distance from the sensor to the optical sensor. That means a 35mm lens is a 35mm lens no matter who makes it or what camera it’s paired with.

Of course, you won’t ever have to do the math yourself (unless you want to). There are plenty of field of view charts (like the ones below) and online field of view calculators available.

It’s also useful to know the field of view if you have a limited space to work in and you need to decide which lens to use. Say, for example, you’re shooting portraits in a small garage and want to use a prime lens. Knowing the FOV will help you know exactly what focal length will work for you.

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A “normal” lens is one where the FOV looks natural and is more or less what the human eye would expect from an image – there’s no noticeable expansion or compression. The nifty-fifty (50mm) is considered normal in 35mm (full-frame) photography and an 80mm lens hits the mark for those shooting medium format.

Field of view definition microscope

Put another way, the focal length is simply the distance from the camera sensor to the place where the light rays converge after going through the lens elements.

“Long lenses” (including telephotos) have longer focal lengths than either a normal or wide-angle lens, and therefore a narrower angle of view. Telephotos, in particular, have a degree of magnification that makes it easier for a subject to upfill more of the frame.

This is determined by the distance between the camera and the subject and the focal length of the lens. A wider field of view will have a larger field size; a narrower field of view will have a smaller field size.

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Note: You only need the (180/π) part if your calculator is working in radians. If yours is working in degrees, leave that part out!

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To make things that are far away fill your camera’s visual field, choose something with a very narrow field of view. A telephoto lens that hits somewhere in the 200mm or 300mm range will have a nice level of magnification. These are the lenses that wildlife and sports photographers favor.

Bumping up to a full-frame sensor, you can see that it takes a longer focal length to get the same angular field of view:

Let’s take a look at just what field of view is, how it relates to lens focal length, and how it ultimately can guide you in knowing which lenses are best for which situations.

The wider lenses like the 16mm or 24mm are used for landscapes, cityscapes, and astrophotography. Photojournalists often favor a 35mm lens – it’s wide enough to capture a fair amount of background yet has less distortion than its wider cousins.

All of the images above were taken from the same location on a full-frame Sony A7 III. The only thing that changed was the focal length of the lens. Here you can clearly see the differences between the camera FOV.

Camera lenses, with the exception of some fisheye lenses, see much less than that. Knowing just how much of the world your camera will see is a key factor in choosing which lens to use.

Since this equation has the sensor size as one of the factors, it also covers crop factor. (Remember, the smaller the sensor size, the smaller the FOV.)

Camerafield of view simulator

On a full-frame camera, a 200mm lens would get a 12-degree FOV, a 50mm lens would come in at 46 degrees, and a 24mm lens would come in at 84 degrees. It would take a 16mm fish-eye to get the full 180-degree horizontal FOV.

(Most of the time horizontal FOV is all we need to know. The exception is the example given above where you need to shoot in a very confined area. In that case, you may need to know your field of view exactly.)

When the FOV is measured in degrees, like on the manufacturer’s lens specs, they’re referring to the angular field of view in the horizontal dimension – from the right to the left edge of the frame. Vertical FOV is measured from the top to the bottom. Diagonal FOV is measured from corner to opposite corner.

FOV cameramodel

We can also go backwards: if you know your field of view and your sensor size, you can figure out what focal length of lens to use. Pretty nifty, no?

The only camera lens that can achieve a 180-degree field of view is a super-wide fisheye lens. Be prepared for plenty of distortion, though.

A normal field of view is one that looks totally natural to the human eye. For full-frame cameras, this would be achieved with a 50mm lens.

Well, sensor size isn’t standardized. Not only is a full-frame sensor on a Canon camera likely to be a slightly different size than a sensor on a Nikon FX camera, but even next-generation cameras of the same line can employ different sensor sizes.

The math behind field of view in photography is a tricky topic, but understanding the concept is pretty simple. This guide breaks it down for you the easy way!

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Well, what most of us are doing when buying a lens according to focal length is imagining what field of view it will create. It’s ultimately what determines what kind of lens you’re going to buy.

Camera FOVcalculator

For example, if you want a lot of the background included in an image, you’ll want to choose a lens with a larger field of view (and a shorter focal length).

Field of view human eye

Some of the calculators even allow you to enter in other variables, too, like the camera distance from the subject, the distance from the subject from the background, etc.

Now the confusing thing is that angle of view and field of view are often used interchangeably, and it’s how most manufacturers refer to field of view, but they’re not quite the same thing.

As we get into the longer lenses the level of compression and magnification goes up as well. A little bit can actually be quite flattering in portraits, which is why 100mm, 105mm, and even up to 135mm can be found in a portrait photographer’s lens collection.

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Don’t worry if math isn’t your thing. We’re including a field of view chart down below. This section is really more for those who love to geek out on how things work.

So, what is a field of view exactly? Simply defined, field of view (FOV) in photography is the observable world you can see through your camera at any given moment. It’s usually expressed in terms of degrees, referring to the literal angle of view your lens allows your sensor to see. This is the widely accepted field of view definition in photography.

If you want to go the whole hog and capture a 180-degree view, you’d need a 10.5mm full-frame fisheye lens. That will, of course, give you plenty of distortion, but some actually like the effect.

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This is pretty much all there is to it…with the exception of a few adjustments to be made for the distortion of super wide-angle lenses (fish-eyes) and the magnification factor of macro lenses.

Different camera sensor sizes have innately different fields of view. Smaller sensors will have a narrower FOV. Larger sensors will innately have a wider FOV.