DEPTH-OF-FIELD Scale, Infrared Photography

DEPTH-OF-FIELD SCALE

You can observe the depth of field through the viewfinder by depressing the depth-of-field preview button when using a camera having this feature. But, unlike other Nikkor lenses, the Zoom-Nikkor 35-70mm f/3.3-4.5 has no color-coded depth-of-field indicators engraved on the lens barrel. However, you can still deter- mine the depth of field by using the scales provided with this manual (see page 45).

To use, first cut out the scales along the lines indicated. Then, place the subject- to-camera distance scale (B) over the depth-of-field scale (A), with the top edge of the (B) scale lined up with the focal length in use, and the distance aligned with the central indicator line of the (A) scale. Now read the numbers (on the B scale) which appear opposite the pair of depth-of-field lines (in the A scale) correspond- ing to the aperture in use. These numbers express the depth of field for the settings in use.

For example, if the lens is prefocused at 1 m (3.5 ft) with the focal length set at 35mm and the aperture at f/22, the numbers on the distance scale opposite the depth-of-field lines for the f/22 setting are the actual depth of field at that time.

INFRARED PHOTOGRAPHY

In infrared photography, the plane of sharpest focus is slightly more distant than the one produced by visible light. As a rule of thumb, you can compensate for shift in focus by referring to the red infrared index lines (f) engraved on the lens barrel. (The line with the green dot at the bottom is for the 35mm focal length setting, while the one with the brown dot is tor 70mm. For intermediate tocal lengths, use the area between the two.) After sharply focusing the subject through the view- finder, check the focused distance and turn the focusing ring to the left until the prefocused distance figure is aligned with the infrared index. Then attach the filter to the lens and take the picture.

SPECIFICATIONS

Focal length: 35mm to 70mm

Maximum aperture: f/3.3 to 4.5

Lens construction: 8 elements in 7 groups

Picture angle: 62° to 34°20'

Distance scale: Graduated in meters and feet from 0.5m (2 ft) to infinity (°°); macro focusing mode at any focal length settings down to 0.35m (1 ft) indicated by the orange line and letter "M"

Focusing/zooming control: Via two independent control rings; focusing is done by turning the focusing ring, zooming by turning the zooming ring right and left. Reference marks for focal length settings of 35mm in green, 50mm in white and 70mm in brown are engraved on the zooming ring; focusing move- ment is continuous into macro mode.