Nikon 25233 D50 User's Manual - Page 115
Lenses, Type D lenses
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Lenses CPU lenses (particularly type G and D lenses) are recommended for use with the D50 (note that IX Nikkor CPU lenses can not be used). CPU lenses can be identified by the presence of CPU contacts. Type G lenses have no aperture ring and are marked with a "G" on the lens barrel. Type D lenses are indicated by a "D." CPU lens Type G lens Type D lens Technical Notes-Optional Accessories Calculating Picture Angle The size of the area exposed by a 35mm camera is 36 × 24 mm. The size of the area exposed by the D50, in con- Lens trast, is 23.7 ×15.6 mm, meaning that the diagonal picture angle of a 35-mm camera is approximately 1.5 times that of the D50. Picture size (35-mm format) (36 mm × 24 mm) Picture diagonal Picture size (D50) (23.7 mm × 15.6 mm) Picture angle (35-mm format) Picture angle (D50) 105