Here are a couple of additional images illustrating the impact of the bug:
Reduced Flash Range
| 1/200 ISO 100 f/16 [with(right)/without(left)] High Speed Sync mode active | |
Longer flash exposures
| 1/200 ISO100 f/5.6 [with(below)/without(above)] High Speed Sync mode active |
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Because high speed sync works by emitting several flash pulses, the power is significantly reduced – the flash can not handle several full power pulses at the speed required for high speed sync.
So instead of having a 1/1000s 1/1 power pulse, you might get something like a 1/200s 1/2 power (or less) pulse. This might not be enough for lighting f/16 or for stopping water.