Originally posted by awaldram 1.21 no change to lag
What you're showing is main flash, not pre-flash, and nothing is timed. I could also raise my finger due to lag in M. As my repeated video timing research indicates, there is virtually no difference in lag between M and pTTL to
pre-flash; previously the extra lag was significant. Nearly all the lag is related to the additional time between pre-flash to exposure. Nothing can resolve that failing until TTL is redesigned - such as the old system of single flash pulse and in-camera sensor.
It isn't a big deal to me because I'm going to avoid pTTL for most flash situations other than macro photography.