What field of view does your lens give on your camera?
Enter a focal length to see the horizontal, vertical and diagonal angle of view, the 35 mm equivalent and the same lens compared across common sensors.
How the tool works
Angle of view is 2 x arctan(sensor size / (2 x focal length)). On a full frame sensor (36 x 24 mm) a 24 mm lens gives 73.7 degrees horizontally, 53.1 degrees vertically and 84.1 degrees diagonally. A smaller sensor sees a narrower angle with the same lens.
The 35 mm equivalent focal length is the focal length that gives the same diagonal angle on full frame. It is the real focal length multiplied by the crop factor, which is 43.27 mm divided by the sensor diagonal. It describes the framing only. It does not change the depth of field or the real focal length.
To work out which lens frames a subject, the calculator uses focal length = sensor width x distance / subject width. This is accurate enough for subjects a few metres away or further, and approximate for close-ups. Sensor sizes are typical values, and the phone figure is an approximation, so check your own camera if you need exact numbers.
Questions
What is the field of view of a 50 mm lens?
On full frame it is about 39.6 degrees horizontally, 27 degrees vertically and 46.8 degrees diagonally. On a Micro Four Thirds camera the same lens gives about 19.6 degrees horizontally.
What does 35 mm equivalent mean?
It is the full frame focal length that would show the same diagonal angle of view. A 25 mm lens on Micro Four Thirds is equivalent to about 50 mm.
Does a crop sensor make the lens longer?
No. The focal length stays the same. The smaller sensor records only the centre of the image circle, so the view is narrower.
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