Using Other Flash Units
The Canonet
Insert the flash into the accessory shoe and connect its cord if it is not a cordless unit.
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Three guide numbers are engraved in blue on the aperture ring. They are for ASA 100 film and distance in meters. For conversion to ASA 25 and feet see the conversion table below. With flash bulbs, set the shutter speed to 1/30 sec. Any speed may be used with electronic flash units.
Guide N o 1 4 2 0 2 8 (ASA100:m) 23 33 46 (ASA 25:ft.)