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The digital readout will be the same as in AE flash control but will also include the “M” signal for manual aperture control. Though the set flash auto working aperture value is displayed in the readout, it is not automatically set as in AE flash control. The same aperture value as set on the flash must be manually set on the lens aperture ring. As in AE flash control, the shutter speed is automatically set at 1/60 sec. as long as the AT dial is not at “B”.
When using an FD lens, exposure warnings are the same as those for AE flash control. Since FL lenses lack a full aperture signal pin, you cannot always rely on the digital readout of apertures and exposure warnings. It is, therefore, advisable to switch off the viewfinder display lever.
3.Manual Flash Control with Canon Speed- lite 155A, 177A, 188A 199A or 577G
The flash is on Manual and the aperture is determined by a guide number calculation and then set manually on the lens aperture ring. The digital readout will include shutter speed, “F” flash signal and the “M” signal for manual aperture control. No aperture data will be displayed. When the flash is set to Manual, the viewfinder will display “M” even if an FD lens is at the “A ” mark.
4.Long Exposures with Canon Speedlites 133A, 155A, 177A, 188A, 199A, 533G and 577G
When the shutter speed is at “B”, the shutter speed data in the digital readout will be replaced by “bu” for “bulb”. The remaining information as well as exposure warnings remain the same as in each of the above three cases.
For example: 1) AE Flash