photo:fov
angular field of view (FOV) or angle of view (AOV)
introduction
angular field of view is the viewable scene through your system measured as an angle
human cone of visual attention is ~55deg which equates to a 43mm focal length lens on a 35mm full frame camera hence lenses with focal lengths in that vicinity are regarded as “standard lenses”
camera lens angle of view
angle of view in radians = 2 x arctan (d/2f) where d = size of dimension of sensor in mm and f = effective actual focal length in mm
for telephoto lenses, this approximates to angle of view in degrees = (180/pi) * (d/f)
effective focal length:
for most photography, this is the actual focal length as stated for the lens
for macrophotography, the effective focal length = actual focal length x (1+magnification factor), such that for a 1:2 macro, the magnification factor is 1.5
for telescopes, effective focal length depends upon whether other elements are used and how they are used such as eyepieces and Barlow lenses
as an example of subject size, apparent angle of the moon and sun is approx. 0.5 deg
35mm full frame camera systems
effective focal length | horizontal fov | vertical fov | diagonal fov |
50mm | 39.6 | 27.0 | 46.8 |
100mm | 19.8 | 13.5 | 23.4 |
200mm | 9.9 | 6.75 | 11.7 |
300mm | 6.6 | 4.5 | 7.8 |
400mm | 4.95 | 3.38 | 5.85 |
500mm | 3.96 | 2.7 | 4.48 |
1000mm | 1.98 | 1.35 | 2.34 |
2000mm | 1 | 0.68 | 1.17 |
5000mm | 0.4 | 0.27 | 0.45 |
Micro Four Thirds or Four Thirds cameras
effective focal length | equivalent focal length in 35mm system | horizontal fov | vertical fov | diagonal fov |
45mm | 90mm | 22 | 16.5 | 27.5 |
50mm | 100mm | 19.8 | 14.88 | 24.78 |
75mm | 150mm | 14.85 | 11.16 | 18.59 |
100mm | 200mm | 9.9 | 7.44 | 12.39 |
135mm | 270mm | 7.3 | 5.5 | 9.2 |
photo/fov.txt · Last modified: 2013/02/17 19:54 by gary1