The Field of View calculation necessarily uses the real focal length of your actual lens. Using Equivalent Focal Length instead of the actual real focal length will produce a huge error. Regardless if Equivalent focal length is mentioned here, DO NOT specify any Equivalent focal length as being the Focal Length actually used on your camera.The applicable one used for a picture is possibly determined in the image EXIF data (but that can be inaccurate, especially if internal focused). Dimensional field of view (in feet, meters, etc) is computed at one specific distance (of same units). The angle is independent of distance (angle is the same at any distance). Angular field of view is commonly stated as the diagonal (which is the circular lens view). Field of View can be expressed as either the angular or dimensional field, and can be horizontal width, vertical height, or as the diagonal.But hints are offered that should determine some usable numbers. Some newest phone models do contain two cameras (for wide and telephoto, which use two different sensors - Not necessarily the same sensor size or crop factor). But Compact and especially cell phone camera specifications don't bother to tell us much, so you may not find the necessary numbers for this calculator. DSLR specifications seem easily determined, and their specifications generally specify all the lens and sensor numbers, accurately, even if rounded a bit. The biggest risks to FoV accuracy are in not actually knowing the specific sensor size or accurate focal length, or your vague guess about the distance likely may not be precise. If you don't know sensor size, Option 4 can be just the ticket for phones and compacts, but if unsure about what it wants, please see this summary of Issues determining Sensor Size which might help.

This otherwise can be a rather difficult task (especially for video formats), and there are still ifs and buts. The image Exif data may show what you need to know to obtain all the required information about your cell phone or compact camera to operate this calculator.

Or somewhat related (same math), another calculator can compute distance or size of an object in a photo. The Depth of Field calculator here also shows Field of View at both subject and at background. Another page is a FoV math section if interested. There's also a large chart of Field of View (angular, in degrees) for many lens focal lengths and a few popular sensors on the next page. More usage descriptions are below the calculator. And the background may be six feet farther back yet, then how large is it? This calculator can plan or verify your choice. What focal length is that field size and distance going to require? (Option 6, and it depends on your sensor size). You know you need to stand back six or eight feet for proper portrait perspective. We don't often care about precise field size, but suppose you plan a portrait to include a 2x3 foot subject area. Field of View is an angle which depends on the focal length and sensor size, but it also computes dimensional Field of View sizes (width, height, or diagonal fields) at some specific distance, like at the subject distance, or at a background distance. This calculator computes the Field of View seen by your camera and lens.

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