40
Exploring Photography
63.9648
43.27
33.53
28.35 26.68
24.86
21.64
Medium format
65 mm
Full frame (35 mm)
43 - 50 mm
APS-H (Canon)
35 mm
APS-C (Nikon DX, Pentax, Sony)
28 - 35 mm
APS-C (Canon)
24 - 28 mm
Foveon (Sigma)
24 mm
Four thirds
22 mm
Figure 3-22. The focal length of a normal lens for a particular camera is about the same as the length of the
fi lm’s or digital sensor’s diagonal distance.
Figure 3-21. The angle of view is the largest angle of light rays that will form an image on the fi lm or digital
sensor.
Angle of view
Focal plane
(film surface or
digital sensor)
Coverage of lens on
focal plane (film surface
or digital sensor)
Maximum
coverage of lens
Lens