Nikon D2H D2H User's Manual - Page 242
Picture Angle and Focal Length, Unlike other CPU
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CPU lenses can be identified by the presence of CPU contacts. Type G lenses are marked with a "G" on the lens barrel, type D lenses with a "D." Technical Notes-Optional Accessories CPU lens Type G lens Type D lens Type G lenses are not equipped with a lens aperture ring. Unlike other CPU lenses, there is no need to lock the aperture ring at the minimum aperture setting (maximum f/-number) when using a type G lens. Picture Angle and Focal Length A 35-mm camera has a diagonal picture angle approximately one-and-ahalf times that of the D2H. When calculating the focal length of the lenses for the D2H 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 D2H 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 D2H 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 D2H, in contrast, Lens is 23.3 ×15.5 mm. As a result, the picture angle of photographs taken with the D2H 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. 230 Picture size (35-mm format) (36 mm × 24 mm) Picture diagonal Picture size (D2H) (23.3 mm × 15.5 mm) Picture angle (35-mm format) Picture angle (D2H)