Nikon D7000 - Manual (Page 294)

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Calculating Angle of View
The size of the area exposed by a 35mm camera is 36 × 24 mm. The size of the area exposed
by the D7000, in contrast, is 23.6 × 15.6 mm, meaning that the angle of view of a 35mm
camera is approximately 1.5 times that of the D7000. The approximate focal length of lenses
for the D7000 in 35mm format can be calculated by multiplying the focal length of the lens
by about 1.5.
Picture size (35mm format)
Lens
(36 × 24 mm)
Picture diagonal
Picture size (D7000)
(23.6 × 15.6 mm)
Angle of view (35mm format)
Angle of view (D7000)