Nikon Photomic FTN Finder Instruction Manual - Page 11

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Nikon Photomic FTN Finder Instruction Manual

Lens Aperture Coupling

The Photomic

FTN takes

advantage of the automatic dia-

phragm feature of Nikkor lenses to measure light with the

lens

wide

open.

Full-aperture

metering gives a bright, clear

finder image for viewing

and

focusing

and

minimizes the

effect

of light

entering the

viewfinder

from

the rear.

order

for the meter to measure exposure at full aperture

with

lenses of different maximum

aperture,

it must be

cou-

pled with the maximum aperture of the lens in use. This is

done

each

time the lens is

attached

changed

by turning

the

aperture

ring

the lens through its

entire

range.

With the lens mounted

the

camera,

twist the aperture

ring

counterclockwise

then clockwise

as far

as it

will go.

This

meshes the

coupling

prong on the lens

with

the pin on

the Photomic

FTN

Finder and adjusts

the meter for the

maximum

aperture

of the lens.

The

adjustment can be

verified by

checking

the maximum

aperture scale on

the

front

of the

finder.

The

scale

has

range from

1.2 to

f/5.6.

For

example

if the 50mm

1.4

lens

is mounted

the

camera,

the red index mark

should

appear between 1.2

and

2.8.

For

instructions for mounting and removing

lenses, see

the

Instruction Booklet for the Nikon

Nikon