CodySLC

The camera definitely knows it is using HSS, and it is certainly guaranteed that the camera will use it for shorter shutter speeds than max sync, because otherwise the frame would be partially...

Greg, the type of flash pulse you are talking about is high-speed sync, where rather than dumping all its power in one burst, the flash is pulsing very very rapidly as the slit between the front...

OK TF, here you go. I don't have a Sony flash, but rather a Sony compatible Sigma (with the Minolta hotshoe). It is the same one that I originally used to show that 1/250 works fine on-camera when...

If it is connected by PC sync cable or any other means except a TTL cable, then yes that is correct.

OK one more test to make this as definitive as it's going to get.Vivitar 283 on-camera at 1/250:Vivitar 283 off-camera triggered by PC sync cable plugged into camera sync port:Vivitar 283...

Incorrect. The difference between the CyberSync test and the PC sync cable test shows that CyberSync's 1/4000 trigger delay is just about right, and not the cause of the problem.

Yes, this. The rear curtain is what is obstructing the sensor. The firing signal sent to the hotshoe & sync port is late.

philbot, my tests agree with that delay, too. The shutter transits the frame in less than 1/250 of a second, and the difference in blockage between PC sync and wireless trigger looks to be 10% of...

OK you don't fully understand this issue, but I have extended my test just to be sure that it is definitive to everyone. Here it is with a PC sync cable attached to the camera's sync port:and with...

You all know that some people take their flashes outside, right?I have Einsteins with Vagabond Mini Lithiums, and I don't have a studio of any sort. Even 1/3 stop is a big deal when you're...