Nikon Photomic FTN Finder Руководство по эксплуатации - Страница 14

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Nikon Photomic FTN Finder Руководство по эксплуатации

EXPOSURE MEASUREMENT WI

THE PHOTOMIC FTN FINDER (F

OUTSIDE

WINDOW

fj]

Correct exposure

Overexposure .....

;

.....

Underexposure

EYEPIECE VIEW

The Photomic

FTN

uses a center-weighted thru-the-

lens metering system that reads the light over the

entire focusing screen but favors the central portion

of the

screen.

This means that it

possible to get

correct exposure in situations where an averaged read-

ing of the entire screen would result in underex-

posure of the main sUbject-with strongly back-

lighted

portraits,

for example. And since measure-

ment 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

determined by a combination of lens aperture and

shutter speed

Since the two are

interrelated,

dif-

ferent 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 desired. Choose a fast shu tter speed to

"freeze"

motion,

a slow one

create deliberate

blur. Use a small lens aperture for wide depth of

field or a large one to make the main subject stand

out and throw unimportant background out of focus.