Modern Classic SLR Series
Some basic information relates to the Original 155A Speedlite

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When used with any camera other than the AE-1, the Speedlite 155A provides typical thyristor automation. You have a choice between two apertures you can use. However, when teamed with the AE-1, the Speedlite 155A automatically sets both the f/stop and the shutter speed. But the later Speedlites designed by Canon also offered similar capability (As what we have refer to as 'dedicated' function - control by the three contact points at the foot of the flash unit, each relay or communicate certain info with the SLR body). Thus, you need not have to specifically locate the 155A for your AE-1.

The basic principle of the Canon's AE flash exposure is automatically determined by the amount of light reflected back from the subject (Not the popular
TTL flash metering as with today's modern cameras).

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Note: When not sufficiently charged - Automatically switches over to normal AE photography.

Green Position: f/5.6 (ISO 100), 0.5m to 3m for auto working range.
Red Position: f/2.8 (ISO 100), 0.5m to 6m for auto working range.
Manual Position: Guide Number is 17 (m).
Continuous flash photography with the Power Winder A in close range work.
Flash coverage angle: adequate for any lens from a 35mm lens on up.
Power Source: Four size AA alkaline batteries (AM-3).
Number of Flashes: More than 300 using AM-3 batteries.
Front view.jpg Backview.jpg Sideview.jpg.
When the neon ready lamp turns on, the Speedlite 155A automatically sets the AE-l's shutter speed to 1/60 second. And it sets the diaphragm opening to the setting indicated on the diaphragm scale according to the position of the aperture-selection switch. As shown, at ASA 100, the Speedlite will set f/5. 6 in the green switch position and f/2.8 in the red switch position. If the neon ready lamp isn't on, the AK-1 programs the f/stop according to the available light. And you get the shutter speed you've set on the speed knob of the camera.

Remove battery compartment by sliding downwards and insert 4 AA-size batteries.

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