Nikon 4DIF Manuel d'instruction - Page 15

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SPECIFICATIONS

Focal length: 500mm

Maximum aperture: f/4

Lens construction: 10 elements in 7groups (plus dustproof glass plate built into front)

Picture angle: 5°

Distance scale: Graduated in meters and feet from 5m (20 ft.) to infinity (°°)

Distance information: Output into F90X/N90s, F90-Series/N90 or F70-Series/N70 cameras

Aperture scale: f/4—f/22 on both standard and aperture-direct-readout scales

Minimum aperture lock: Provided

Diaphragm: Fully automatic

Exposure measurement: Via full-aperture method with AI cameras or cameras with CPU

interface system; via stop-down method for other cameras

Focusing: Nikon Internal Focusing (IF) system

Tripod mounting: Built-in tripod mounting collar rotatable through 360°

Lens hood: Provided

Filters: Slip-in glass filter holder accepts 39mm screw-in filters; gelatin filter holder accepts

gelatin filters

Mount: Nikon bayonet mount

Dimensions: Approx. 139 mm (5.5 in.) dia. x 370mm (14.6 in.) extension from flange; approx.

378mm (14.9 in.) long (overall)

Weight: Approx. 4200g (148.2 oz.)

LENS CARE

• Clean lens surface with a blower brush. To remove dirt and smudges, use a soft, clean cotton

cloth or lens tissue moistened with ethanol (alcohol) or lens cleaner. Wipe in a circular

motion from center to outer edge, taking care not to leave traces and not to touch the other

lens parts.

If you use ether in cleaning the lens, a smudge sometimes appears on the surface of a multi-

coated lens. If this happens, wipe it again with a cotton cloth moistened with alcohol.

• Take care in cleaning the rear part of the lens with a spraygun-type blower because its strong

stream of air may damage the lens diaphragm blades. To avoid damage, set the lens at full

aperture and use the blower far enough away.

• Always protect the lens surface from dirt or damage. The lens hood also helps to protect the

lens.

• Keep the lens cap in place whenever the lens is not in use.

• If you will not use the lens for a long time, protect it from rust and mold by storing it in a

cool, dry place. Also, do not store in direct sunlight, and keep it away from naphthalene or

camphor.

• Be careful not to get the lens wet or drop it in water. Water on the lens may cause

malfunction.