Nikon PhotomicF Tn Finder 사용 설명서 - 페이지 14

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EXPOSURE MEASUREMENT WITH THE PHOTOMIC FTn FINDER

OUTSIDE WINDOW

Correct exposure

Overexposure

EYEPIECE VIEW

The Photomic FTN uses a center-weighted thru-thelens metering sys-

tem that reads the light over the entire focusing screen but favors the

central portion of the screen. This means that it is possible to get cor-

rect exposure in situations where an averaged reading of the entire screen

would result in underexposure of the main subject-with strongly back-

lighted portraits, for example. And since measurement is always done

at full aperture with Auto Nikkor lenses, the viewfinder image is bright

and clear.

The amount of light reaching the film (exposure) is detemmined by a

combination of lens aperture and shutter speed. Since the two are inter-

related, different combinations will give the same amount of exposure.

For example, 1/500 second at f/2 is the same as 1/30 second at f/8.

The choice of aperture and shutter speed depends on the results de-

sired. Choose a fast shutter speed to "freeze" motion, a slow one to

create deliberate blur. Use a smaU lens aperture for wide depth of field

or a large one to make the main subject stand out and throw unimpor-

tant background out of focus.

Underexposure

(Full-Aperture Measuring Method)