Asaiiso Film Speed Dial; Shutter Speed Dial/Exposure Determination; Setting The Shutter Speed - Nikon FM2 Instruction Manual

-CONTROLS IN DETAIL-continued---------
ASAIISO film speed dial
®
The ASAIISO scale on the dial has numbered settings for
speeds from ASAIISO 12 to 6400. The dots between each pair of
ASAIISO numbers stand for intermediate settings, such as 64,
80, etc. The illustration above gives the speeds for all inter-
mediate settings. ASAIISO 100 and 400 are indicated in red as
they are used quite often .
ASAIISO 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 ASAIISO of your film is indicated on
the cartridge itself. It is also printed on the film carton and on
the data sheet packed inside.
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Shutter speed dial
®
'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.