Digital readout in flash photography – Canon A-1 User Manual
Page 151
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Digital Readout in Flash Photography
When you preview exposure in flash photo
graphy, the digital readout will differ de
pending on the type of flash photography.
1. AE flash with Canon Speedlite 133A,
155A, 177A or 199A and an FD Lens
The flash is on Auto while the lens is set to
the “A” mark. The digital readout will
display a shutter speed of 1/60 sec., the flash
signal “F” and the auto working aperture set
on the flash as follows; 60 F 2.8. The A-1
automatically switches to 1/60 sec. when the
flash is charged regardless of the shutter
speed set as long as it is not set to “B”. The
“F” flash signal appears in the viewfinder
only when the flash pilot lamp lights up to
indicate that the flash is charged. Thus,
you will know the flash is ready simply by
looking in the viewfinder. The aperture value
displayed
is
the
auto
working
aperture
you have set on the flash depending on the
ASA film speed. (The aperture displayed
in the readout may be 1/2 f/stop larger or
smaller than the auto working aperture set
on the flash though the auto working
aperture is the effective aperture). The auto
working aperture value is automatically set
on the camera.