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ACalculating Angle of View (Continued)
The DX(2 4 × 16) angle of view is about 1.5 times smaller than the 35mm
format angle of view, while the 1.2×(30× 20) angle of view is about 1.2
times smaller and the 5: 4 (30× 24) angle of view is about 1.1 times
smaller.
To calculate the focal length of lenses in 35mm format when
DX(2 4 × 16) is selected, multiply the focal length of the lens by about
1.5, by about 1.2 when is 1.2×(30× 20) selected, or by about 1.1 when
5: 4 (30× 24) is selected (for example, the effective focal length of a
50mm lens in 35mm format would be 75mm when DX (24 ×16) is
selected, 60 mm when 1.2×(30 ×20) is selected, or 55 mm when
5: 4 (30 ×24) is selected).