Nikon D100 Product Manual - Page 191
Picture Angle and Focal Length
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Technical Notes-Optional Accessories Lenses and Other Accessories Picture Angle and Focal Length A 35-mm camera has a diagonal picture angle approximately one-and-a-half times that of the D100. When calculating the focal length of the lenses for the D100 in 35-mm format, you will therefore need to multiply the focal length of the lens by 1.5, as shown in the following table: Picture angle Approximate focal length (mm) in 35-mm format (modified for picture angle) 35-mm film camera 17 20 24 28 35 50 60 85 D100 25.5 30 36 42 52.5 75 90 127.5 35-mm film camera 105 135 180 200 300 400 500 600 D100 157.5 202.5 270 300 450 600 750 900 Calculating Picture Angle The size of the area exposed by a 35-mm camera is 24 × 36 mm. The size of the area exposed by the D100, in contrast, is Lens 15.6 × 23.7 mm. As a result, the picture angle of photographs taken with the D100 differs from the picture angle for 35-mm cameras, even when the focal length of the lens and the distance to the subject are the same. Picture size (35-mm format) (24 mm × 36 mm) Picture diagonal Picture size (D100) (15.6 mm × 23.7 mm) Picture angle (35-mm format) Picture angle (D100) 179