Nikon 25214 D70 User's Guide - Page 195

Technical Notes-Optional Accessories Picture Angle and Focal Length A 35-mm camera has a diagonal picture angle approximately one-and-a-half times that of the D70. When calculating the focal length of lenses for the D70 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 35-mm film camera D70 Approximate focal length (mm) in 35-mm format (modified for picture angle) 17 20 24 28 35 50 60 85 25.5 30 36 42 52.5 75 90 127.5 35-mm film camera 105 135 180 200 300 400 500 600 D70 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 36 × 24 mm. The size of the area exposed by the D70, in contrast, Lens is 23.7 ×15.6 mm. As a result, the picture angle of photographs taken with the D70 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) (36 mm × 24 mm) Picture diagonal Picture size (D70) (23.7 mm × 15.6 mm) Picture angle (35-mm format) Picture angle (D70) 185