Nikon D2HS - Manual (Page 248)

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Technical Notes—Optional Accessories
CPU lenses can be iden ti fi ed by the presence of CPU contacts. Type G lenses
are marked with a “G” on the lens barrel, type D lenses with a “D.”
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
The diagonal picture angle of the D2Hs is less than that of a 35-mm cam era.
When cal cu lat ing the focal length of the lenses for the D2Hs in 35-mm for-
mat, mul ti ply the focal length of the lens by about 1.5:
CPU lens Type G lens Type D lens
Cal cu lat ing Picture Angle
The size of the area exposed by a 35-mm cam-
era is 36 × 24 mm. The size of the area exposed
by the D2Hs, in contrast, is 23.3 × 15.5 mm.
As a result, the picture angle of photographs
taken with the D2Hs differs from the picture
angle for 35-mm cameras, even when the fo-
cal length of the lens and the distance to the
subject are the same.
Picture size (D2Hs)
Picture size (35-mm format)
Lens
Picture diagonal
Picture angle (35-mm format)
Picture angle (D2Hs)
(36 mm × 24 mm)
(23.3 mm × 15.5 mm)
Picture angle
Approximate focal length (mm) in 35-mm format
(modifi ed for picture angle)
35-mm fi lm camera 20 24 28 35 50 60 85 17
30 36 42 52.5 75 90 127.5 25.5 D2Hs
35-mm fi lm camera 135 180 200 300 400 500 600 105
202.5 270 300 450 600 750 900 157.5 D2Hs