Nikon FM2 Manuel d'utilisateur télécharger pdf (Page 24)

CONTROLS IN DETAIL —continued

ASA/ISO film speed dial ®

The ASA/ISO scale on the dial has numbered settings for

speeds from ASA/iS012 to 6400. The dots between each pair of

ASA/ISO numbers stand for intermediate settings, such as 64,

80, etc. The iliustration above gives the speeds for ali infer-

mediate settings. ASA/iSO 100 and 400 are indicated in red as

they are used quite often.

ASA/ISO is a numerical rating of the film's sensitivity to a given

amount of light. The higher the number, the greater the sensi

tivity, and vice versa. The ASA/ISO of your film is indicated on

the cartridge itself. It is also printed on the film carton and on

the data sheet packed inside.

Shutter speed dial ® I exposure

determination

Setting the shutter speed

To set the shutter speed, turn the shutter speed dial to the right

or left until the desired shutter speed number click-stops and is

aligned with the shutter speed index ®. The dial has indications

for B (bulb) and for shutter speeds from 1 to 1/4000 sec. The 250

engraved in red indicates the fastest sync speed for an electronic

flash unit. On B. the shutter curtains ® remain open for as long

as the shutter release button is kept depressed. 1 is for indicat

ing one second, 2 for 1/2 sec., 60 for 1/60 sec. and so on. One of

the two adjoining numbers, excluding B is two times or 1/2 as

much as the exposure amount of the other number. Note that

shutter speeds between printed numbers (i.e., intermediate

speeds) cannot be used. Since you can always confirm the

shutter speed number inside the viewfinder, you don't have to

see the shutter speed dial as you turn it.

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Nikon FM2 Manuel d'utilisateur Page 24