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 D1X, however, it is 15.6 ⋅ 23.7 mm. Consequently, the picture angle of photographs taken with the D1X 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.
Picture size (35-mm format) (24 mm ⋅ 36 mm)
Picture diagonal
Lens
Picture size (D1x) (15.6 mm ⋅ 23.7 mm)
Picture angle (35-mm format)
Picture angle (D1x)
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 D1X, the corresponding focal length in 35mm format at the D1X’s picture angle can be calculated by multiplying the focal length of the lens by 1.5. The following chart shows some examples:
Picture angle | Approximate Focal length (mm) in 35-mm format |
| | (modified for picture angle) | | |
| | | | |
35-mm film camera | 17 | 20 | 24 | 28 | 35 | 50 | 60 | 85 |
D1X | 25.5 | 30 | 36 | 42 | 52.5 | 75 | 90 | 127.5 |
Picture angle | Approximate Focal length (mm) in 35-mm format |
| | (modified for picture angle) | | |
| | | | |
35-mm film camera | 105 | 135 | 180 | 200 | 300 | 400 | 500 | 600 |
D1X | 157.5 | 202.5 | 270 | 300 | 450 | 600 | 750 | 900 |
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 aperture ring; the sub-command dial can not be used to set aperture. The aperture indicators in the viewfinder and in the control panel on top of the camera will show F--.
