Nikon F/4 instruction manual DEPTH-OF-FIELD Scale, Infrared Photography, Features/Specifications

To zoom in or out, look through the viewfinder and slide the focusing ring back and forth until the desired composition is framed on the focusing screen. As the ring is pushed forward for shorter focal lengths, a five- position scale is uncovered on the lens barrel to show which focal length the lens is set for. To preset the lens for a specific focal length, align the edge of the focusing ring with the top edge of the digits.

DEPTH-OF-FIELD SCALE D

A group of colored lines, curving out toward the front of the lens, are engraved on the lens barrel. To find the depth of field at a particular focal length and aperture, first compose and focus the lens on the subject. Then check the numbers on the distance scale opposite the colored lines to find the depth of field at that aperture. The colors of the pairs of lines correspond to different lens apertures. The continuous curved lines of the depth-of-field scale give the reading at any focal length. You can also observe the depth of field through the viewfinder by pressing the depth-of-field preview button on the camera.

INFRARED PHOTOGRAPHY E

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 compen- sate for shift in focus by referring to the curved red infrared line engraved between the depth-of-field index lines on the lens barrel.

After sharply focusing the subject through the viewfinder, check the focused distance and turn the focusing ring to the left until the prefocused distance figure is aligned with the infrared compensation line. Then attach the filter to the lens and take the picture.

FEATURES/SPECIFICATIONS

Focal length: 80mm ~ 200mm

Maximum aperture: f/4

Lens construction: 13 elements in 9 groups

Picture angle: 3 0 ° 1 0 ' ~ 12°20'

Distance scale: Graduated in meters and feet from 1,2m (4 ft) to infinity (°°)

Focusing/Zooming control: Via a single control ring; reference marks for focal length settings of 80mm, 90mm, 105mm, 135mm and 200mm are provided

Aperture scale: f/4 ~ f/32 on both standard and aperture-direct-readout scales

Diaphragm: Fully automatic

Exposure measurement: Via full-aperture method; meter coupling ridge pro- vided for A l cameras and meter coupling shoe for non-AI cameras

Attachment size: 62mm (P=0.75mm)

Filters: 62mm screw-in

Mount: Nikon bayonet mount

Dimensions: Approx. 73mm0 x 154mm extension from flange; approx. 162mm long (total)

Weight: Approx. 81 Og

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