Lens care, Specifications – Nikon 4DIF User Manual
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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 Al 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 hlower 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.
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