Nikon D7100 Product Manual - Page 330
Calculating Angle of View, DX 24×16, Image area, 3× 18×12
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A 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 D7100 when DX (24×16) is selected for Image area in the shooting menu, in contrast, is 23.5 × 15.6 mm, meaning that the angle of view of a 35mm camera is approximately 1.5 times that of the D7100 (when 1.3× (18×12) is selected, the size of the area exposed is reduced and the angle of view is reduced by a further 1.3×). Picture size (35mm format) (36 × 24 mm) Picture size when DX (24×16) is selected for Image area (23.5 × 15.6 mm) Picture size when 1.3× (18×12) is selected for Image area (18.8 × 12.5 mm) Picture diagonal Lens Angle of view (35mm format) Angle of view when DX (24×16) is selected for Image area Angle of view when 1.3× (18×12) is selected for Image area n 302