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The guide number
at
various film
speeds and
zoom head
settings
is
shown in the
following
table:
Guide numbers
in
the manual mode
Unit'
m(tt)
Zoom head
ASAIISO film
speed
setting
800
400
200
100
50
25
T
119(390)
84 (276)
59 (194) 42
(138) 30(98)
21
(69)
S
107
(351) 76 (250) 54 (177) 38 (125) 27 (89)
19
(62)
N
90 (295) 64 (210)
45
(148) 32 (105)
22 (72)
16
(52)
W,
'
76 (250) 54 (177) 38 (125) 27 (89)
19
(62)
13
(43)
W,'
54 (177l 38 (125) 27(89)
19(62)
13 (43) 9.5 (31)
*
W
,
is used when the wide-flash adapter is attached
to
the
flash unit
with the
zoom head
set
at
W,.
For motor drive (MD) operation
After setting
the ASA/ISO film
speed and zoom
setting
knob on
the
exposure calculator dial
,
focu
s
on the
sub-
ject
;
then look
at the
lens
and read off the
focu sed
dis-
tance to
determine exact
ly how
far
away
the
subject
actually
is.
31
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