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201
TECHNICAL NO
TES—OPTIONAL
ACCESSORIES
Using a Non-CPU Lens
When using a non-CPU lens, choose center-weighted or spot metering and set the exposure
mode to aperture-priority auto or manual. Even if you choose programmed auto or shutter-
priority auto, the camera will automatically select aperture-priority auto with center-weighted
metering, and the exposure mode indicator (P or S) in the control panel on top of the camera
will blink to show that aperture-priority auto is in effect (the viewfinder display will show A).
Regardless of the exposure mode selected, aperture can only be set using the lens aper ture
ring; the sub-command dial can not be used to set aper ture. The aper ture indicators in the
viewfinder and in the control panel on top of the camera will show F --.
Lens Focal Length and Picture Angle
The size of the area exposed with a 35-mm camera is 24 × 36 mm. In the case of
the D1
X, however, it is 15.6 × 23.7 mm. Consequently, the picture angle of photo-
graphs taken with the D1
X will differ 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.
25.5D1X 30 36 42 52.5 75 90 127.5
1735-mm film camera 20 24 28 35 50 60 85
Picture angle
Approximate Focal length (mm) in 35-mm format
(modified for picture angle)
157.5D1X 202.5 270 300 450 600 750 900
10535-mm film camera 135 180 200 300 400 500 600
Picture angle
Approximate Focal length (mm) in 35-mm format
(modified for picture angle)
The diagonal picture angle of a 35-mm camera is roughly 1.5 times that of the D1X.
Consequently when a lens of a given focal length is attached to the D1
X, the corre-
sponding focal length in 35mm format at the D1
X’s picture angle can be calculated
by multiplying the focal length of the lens by 1.5. The following chart shows some
examples:
Picture size (D1x)
Picture size (35-mm format)
Lens
Picture diagonal
Picture angle (35-mm format)
Picture angle (D1x)
(24 mm × 36 mm)
(15.6 mm × 23.7 mm)
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