Nikon D1 - Manual (Page 124)

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Identifying D-Type Nikkor Lenses with a Built-in CPU
D-Type Nikkor lenses with a built-in CPU can be identified by the CPU contacts
(A) and the “D” mark on the lens (B).
Lens Focal Length and Picture Angle
The size of the area exposed with a 35mm camera is 24
×
36mm. In the case
of the D1, however, it is 15.6
×
23.7mm. Consequently, the picture angle of
photographs taken with the D1 will differ from the picture angle for 35mm
cameras, even when the focal length of the lens and the distance to the subject
are the same.
The diagonal picture angle of a 35mm camera is roughly 1.5 times that of the
D1. Consequently when a lens of a given focal length is attached to the D1,
the corresponding focal length in 35mm format at the D1’s picture angle can
be calculated by multiplying the focal length of the lens by 1.5. The following
chart shows some examples:
Picture Focal length (mm) in 35mm format
angle modified for picture angle
35mm camera 17 20 24 28 35 50 60 85
D1 25.5 30 36 42 52.5 75 90 127.5
Picture Focal length (mm) in 35mm format
angle modified for picture angle
35mm camera 105 135 180 200 300 400 500 600
D1 157.5 202.5 270 300 450 600 750 900
Tip
Technical Notes: Compatible Lenses
“Picture angle”
Picture angle determines how much of the subject appears in the final photograph.
A B