Nikon AF-S DX Micro- Nikkor 40mm f/2.8G Manuel de l'utilisateur - Page 7

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Nikon AF-S DX Micro- Nikkor 40mm f/2.8G Manuel de l'utilisateur

■ Changes to the Effective f-number

With this lens, the higher the reproduction ratio (the shorter

the focus distance), the darker the image that falls on the

image sensor and the higher the effective f-number (see the

figure on page 162). The camera automatically compensates

for this effect when metering exposure or adjusting flash

output using TTL flash control, and shows the adjusted value

for aperture in the control panel and viewfinder displays.

■ Built-in Flash Units

When using the built-in flash on cameras equipped with a

built-in flash unit, shoot at ranges of 0.6 m (2 ft) or more and

remove the lens hood to prevent vignetting (shadows created

where the end of the lens obscures the built-in flash).

■ The Lens Hood

The lens hoods protect the lens and block stray light that

would otherwise cause flare or ghosting.

When attaching or removing the hood, hold it near the

symbol on its base and avoid gripping it too tightly.

Vignetting may occur if the hood is not correctly attached.

The hood can be reversed and mounted on the lens when not

in use. When the hood is reversed, it can be attached and

removed by rotating it while holding it near the lock mark (

Align the lens hood lock mark (— ) with the

lens hood mounting mark (●) on the lens

(e).

—