Lens Field of View Calculator
Enter focal length and sensor format to get horizontal, vertical, and diagonal field of view — plus coverage width and height at your subject distance. Nothing uploaded.
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Learn more: camera lens field of view
Why FoV calculations matter before you rent or buy
Renting a cinema lens costs 200-500 per day. Buying a prime lens for event photography costs 800-2000. Knowing the actual field of view before committing is the difference between a lens that works for your shot and one that doesn't. A 35mm lens on a Sony APS-C gives the same field of view as a 52mm on full frame - it is not a wide angle at all.
Horizontal, vertical, and diagonal FoV
Horizontal FoV is the angle the lens covers from left to right - the most useful number for landscape and portrait composition. Diagonal FoV is measured corner-to-corner and is typically larger. Manufacturer specs often quote diagonal FoV because it is the largest number. The coverage calculator is especially useful for event photography and real estate: enter the room width and your shooting distance to see exactly whether your 24mm wide angle covers the whole room from the doorway.
Crop factors and full-frame equivalents
Canon APS-C has a 1.6x crop factor; Nikon/Sony APS-C uses 1.5x. This means a 50mm lens on an APS-C camera gives the equivalent field of view of an 80mm (Canon) or 75mm (Nikon) lens on full frame. The calculator shows the equivalent focal length for every sensor format, helping you understand how a lens behaves on different camera bodies.
FAQ
What is the crop factor for APS-C cameras?
Canon APS-C has a 1.6x crop factor; Nikon/Sony APS-C uses 1.5x. This means a 50mm lens on an APS-C camera gives the equivalent field of view of an 80mm (Canon) or 75mm (Nikon) lens on full frame. The calculator shows the equivalent focal length for every sensor format.
What is the difference between horizontal and diagonal field of view?
Horizontal FoV is the angle the lens covers from left to right - the most useful number for composition. Diagonal is measured corner-to-corner and always larger. Manufacturers often quote diagonal because it is the biggest number. This calculator shows all three.
How do I use the coverage calculator?
Enter a subject distance and see frame width and height in metres. This is useful for event photography (how many people fit in frame?), real estate (does the room fit from the doorway?), and astrophotography planning.