An iPhone application from Resolve Optics (Chesham, UK) simplifies lens field of view (FOV) calculations. Available in two versions, the FOV Calc App allows users to determine a required focal length lens. The app can also calculate the field-of-view provided by a lens of a given focal length at a known distance or infinity. FOV Calc Lite, the free version, has 8 commonly used sensor formats pre-installed. The full version of the App, FOV Calc, has the 8 preinstalled formats, but also provides the option of editing, adding, deleting, and saving sensor formats. The app requires knowledge of sensor format and focal length.
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