Nikon 2179 user manual Variable maximum apertures, Built-in flash and vignetting, Lens care

Variable maximum apertures

Zooming the lens changes the maximum aperture by up to 11/3 stop.

However, the camera will compensate for any change in aperture by adjusting the shutter speed so as to maintain the correct exposure value.

The built-in flash and vignetting

Vignetting is the darkening of the corners around the image that occurs when the light emitted by the flash is obstructed by the lens hood 1, or lens barrel, depending on the focal length or shooting distance.

•To prevent vignetting, do not use the lens hood 1.

•The built-in flash cannot be used over distances of less than 0.6 m (2.0 ft.).

Digital-SLR cameras	Supported focal length/
	shooting distance
D700/D300/D200/	No vignetting occurs at any focal
D100/D80	length
D90/D70-series	• 18mm/1.5 m (4.9 ft.) or greater
	• 24mm or longer/no restrictions
D50	• 18mm/1 m (3.3 ft.) or greater
	• 24mm or longer/no restrictions
	• 18mm/2.5 m (8.2 ft.) or greater
D60/D40-series	• 24mm/1 m (3.3 ft.) or greater
	• 35mm or longer/no restrictions

The built-in flash on the D100 and D70 is compatible with focal lengths of 20mm or greater.

Vignetting occurs at a focal length of 18mm.

Lens care

•Be careful not to allow the CPU contacts 0 to become dirty or damaged.

•Clean lens surfaces 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 the center to the outer edge, taking care not to leave traces or touch other parts of the lens.

•Never use organic solvent such as thinner or benzene to clean the lens.

•NC filters are available to protect the front lens element. The lens hood 1 also helps to protect the

front of the lens. En

•When storing the lens in its flexible lens pouch, attach

both the front and rear lens caps. The lens can also be stored with the lens hood 1attached in the reverse position.

•When the lens is mounted on a camera, do not pick up or hold the camera and lens by the lens hood 1.

•When the lens will not be used for an extended period of time, store it in a cool, dry place to prevent mold and rust. Be sure to store the lens away from direct sunlight or chemicals such as camphor or naphthalene.

•Do not get water on the lens or drop it in water as this will cause it to rust and malfunction.

•Reinforced plastic is used for certain parts of the lens. To avoid damage, never leave the lens in an excessively hot place.

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