Canon F-1 Instructions Manual page 48

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Manual flash is also possible with the Speedlite 133D
on MANUAL. In this case, it is necessary to figure the
correct aperture by guide number formula:
Aperture =
Make sure both guide number and shooting distance are
in the same unit, whether meters or feet. For further
details on the use of the Canon Speedlite 133D, please
see its instructions.
The following table gives proper synchronization shutter
speeds for flash photography with various other types of
flash units and bulbs. When using a flash other than
Speedlite 133D, it is necessary to figure the correct
aperture by guide number calculation as described above
or, in the case of an automatic electronic unit, by its
calculator dial. Follow the instructions of the particular
flash.
Type
FP class (#6, Press 26)
Flash-
M class (M3, #5, Press 25)
bulbs
AG-1, AG-3
MF class
(M2, Flashcube)
Electronic Flash Unit
48
Guide Number
Shooting Distance
Synchronised
Shutter Speeds
1/125 or faster
1/30 or slower
1/30 or slower
1/30 or slower
1/60 or slower