Nikon Nikkormat FT3 Руководство по эксплуатации - Страница 22

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DEPTH OF FI ELD - continued

Depth-of-Field Scale

Depth of field can be read from the color-coded scale

engraved

on the milled ring. The pairs of

colored

lines

correspond to flnumbers of the same color. To find

the depth of field at a particular aperture first focus

the lens on the subject (or set the lens-to-subject dis-

tance on the distance scale). Then check the numbers

on the distance scale opposite the colored lines which

match the taking aperture of the corresponding color

to find the depth of field at that aperture.

For example,

f/16

on the aperture ring of the 50mm

f/l.4

lens is blue. With the lens prefocused at 15 feet

(4.5m), the numbers on the distance scale opposite

the blue lines show that depth of field extends from

8 feet (2.4m) to infinity

(00).

stopping

down the

lens only, the depth of

field

can

be increased, as

illustrated

by the

following three

photographs:

Lens at f/4. Small

depth of field

with

only

main

subject in focus.