Nikon D2Hs User Manual page 248

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."
CPU 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
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:
Picture angle
35-mm fi lm camera
D2Hs
35-mm fi lm camera
D2Hs
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.
234
Type G lens
Approximate focal length (mm) in 35-mm format
(modifi ed for picture angle)
17 20 24
25.5 30 36
105 135 180
157.5 202.5 270
Type D lens
28 35 50
42 52.5 75
200 300 400
300 450 600
Lens
Picture angle (35-mm format)
Picture angle (D2Hs)
60 85
90 127.5
500 600
750 900
Picture size (35-mm format)
(36 mm × 24 mm)
Picture diagonal
Picture size (D2Hs)
(23.3 mm × 15.5 mm)