Flash
The EOS 100 had an integrated retractable TTL flash. Information via the EF lens mount was used to optimise the zoom setting of the flash. It had three zooms to cover the focal lengths of 28 mm, 50 mm and 80 mm. Consequently, its guide number for ISO 100 varied between 12 m at 28 mm, to 18 m at 80 mm.
The focal plane shutter gave an X-sync speed of 1/125 second. The flash would normally fire when the first curtain had finished its travel, but this could be changed to the second curtain via a custom function.
Red-eye reduction was achieved by producing a piercing continuous bright light to the left of the flash. This would shine while the flash capacitors were charged.
The flash shoe contained signals for X-sync, red-eye reduction and second curtain sync.
Read more about this topic: Canon EOS 100
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