Nikon Speedlight Manuel d'instruction - Page 10

Parcourez en ligne ou téléchargez le pdf Manuel d'instruction pour {nom_de_la_catégorie} Nikon Speedlight. Nikon Speedlight 26 pages.

F L A S H P H O T O G R A P H Y W I T H B A S I C A S S E M B L Y - c o n t i n u e d

Exposure Determination

The exposure calculator disc helps you find the

f-number for correct exposure at any flash-to-subject

distance. Set the speed of the film you are usrng

opposite the triangular index mark by turning the

disc. Then read off the f-number which appears

opposite the distance.

There are two index marks; a white mark (B&W) for

black-and-white film and a red one (COLOR) for

color. Dots between the numbers on the film speed

scale represent intermediate settings such as 32, 40,

etc. The flash-to-subject distance scale is marked in

both feet and meters.

For example, if color film with a speed of ASA 25 is

used, 12 feet appears opposite fl4. lf a black-and-

white film with a speed of ASA 125 is used, 9 feet

appears opposite f/16.

GN Au to Nik k or 45 mm f / 2 .8 l e n s

The Nikon Speedlight Unit's exposure calculator disc

also has a scale for use with the GN Auto Nikkor lens.

This ingenious lens has been designed to provide fully

automatic exposure determination in flash photo-

graphy. Once the lens has been set for the film speed

and speedlight guide number, it automatically changes

the aperture diaphragm as you focus: there is no need

to estimate distances and calculate apertures.

To find the guide number for a particular film/speed-

light combination, set the film speed opposite the

triangular index mark on the film speed scale. The

guide number will appear opposite the arrow on the

guide number scale. The guide number scale is marked

in both feet and meters.

For additional information, consult the instruction

booklet which comes with the GN Auto Nikkor lens.

F l a s h - t o - S u b j e c t

D i s t a n c e S c a l e

F / n u m b e r S c a l e

G u i d e N u m b e r

S c a l e f o r G N

A u t o N i k k o r

F i l m S p e e d I n d e x

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