Field of View Calculator

Field of view (or angle of view) is how wide a scene a lens captures, expressed in degrees. It depends on both focal length and sensor size: FOV = 2 × arctan(sensor width ÷ (2 × focal length)). Shorter focal lengths and larger sensors both produce a wider field of view.

This is why the same focal length looks different on different cameras — a 50mm lens frames much more of a scene on a full-frame sensor (36mm wide) than on a smaller APS-C or Micro Four Thirds sensor, because the smaller sensor only captures the center portion of the lens's projected image circle.

Example: a 50mm lens on a full-frame sensor (36mm wide) has a horizontal field of view of about 39.6°. The same lens on an APS-C sensor (23.6mm wide) narrows to roughly 26.6°, similar to what a longer lens would show on full frame.

Horizontal FOV depends on sensor width and focal length — crop sensors need shorter focal lengths for the same FOV as full frame.

Security camera specs often list horizontal FOV — match sensor size to the spec sheet for accurate planning.

FOV narrows as focal length increases — telephoto lenses cover less scene width at the same distance.

Vertical and diagonal FOV differ from horizontal — architectural interiors often need vertical FOV to ensure ceiling height fits; this tool emphasizes horizontal angle from sensor width and focal length. Vertical FOV matters for ceiling height in architecture — horizontal angle alone may miss whether a tall interior fits in frame at 50 mm. Bracket focal lengths on set when venue layouts require proof that vertical field of view clears the ceiling.

Panorama stitching overlaps reduce effective FOV per frame — two overlapping 39° horizontal FOV shots do not equal 78° seamless FOV after crop; plan overlap in degrees when building multi-row panos. Pano overlap reduces effective FOV per frame — two 39° shots do not stitch to 78° seamless after crop; plan overlap in degrees. Overlap pano frames generously when stitched deliverables must hide crop loss between adjacent shots.

Fifty-millimeter on full-frame yields ~39.6° horizontal FOV — stepping back with 35mm (~54°) captures the same group width at closer distance, useful in tight reception halls. 50 mm full-frame ~39.6° horizontal — 35 mm ~54° captures the same group width from closer in tight reception halls. Walk backward with a wider lens when tight reception halls need proof the group width still fits in frame.