Guide Numbers - Vivitar 283 Service Manual

Automatic Electronic Flash
Model 283
1.3 GUIDE NUMBERS
MAN UAL OPERATION
Gu ide Numbers (ASA-Feet}
ASA Film Speed 25
Flash Guide No.
60
Guide Numbers (DIN-Meter)
DIN Film Speed 15
Flash Guide No. 18
64
96
19
29
Table 1-1. Guide Numbers
80 100 125 160 200
108
120
135
150 170
20 21 22 23 24
32
36 40 45
51
Table 1-2. Automatic Operation f -Stop Settings
AUTOMATIC OPERATION
Auto f-Stop settings to the closest half-stop:
Film Speed :
ASA 25
64*
80* 100* 125* 160* 200*
DIN
15 19 20 21 22 23 24
YELLOW Mode 1.4 2.4 2.4 2.8 3.5 3.5 4
RED Mode 2 3.5 3.5 4 4.7 4.7
5.6
BLUE Mode 4 6.7 6.7
8 9.5 9.5
11
PURPLE Mode
5.6 9.5 9.5 11 14 14 16
400 800
240 340
27 30
72 100
400
800
27 30
5.6 8
8
11
16
22
22 32
*These ASA fi lm speeds differ by only 1/ 3 of an f-stop. The resulting change in exposure is so slight that a
change in the Auto f-stop may not be indicated.
2
Vi vitar 37460 598 ( 11 /80)
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