Nikon S2J00200401 Lens Focal Length and Picture Angle, Using a Non-CPU Lens, 201, Picture angle

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 D1H, however, it is 15.6 ⋅ 23.7 mm. Consequently, the picture angle of photo- graphs taken with the D1H 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 (D1H) (15.6 mm ⋅ 23.7 mm)

Picture angle (35-mm format)

Picture angle (D1H)

The diagonal picture angle of a 35-mm camera is roughly 1.5 times that of the D1H. Consequently when a lens of a given focal length is attached to the D1H, the corre- sponding focal length in 35mm format at the D1H’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
D1H	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
D1H	157.5	202.5	270	300	450	600	750	900

TECHNICAL NOTES—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 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--.

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