The really unpublicized part of this is that when you move away from TTL, these cameras can sync up to their maximum shutter speed - at least the D1x can. I know the others can sync faster than their maximum TTL sync speeds. I ran a PC cable between the PC ports on the D1x and an SB-26 flash. I was able to sync with no shutter banding at 1/2000, 1/4000, 1/8000, and, wait for it, 1/16000 sec. Yes you read that right - one sixteen thousandth of a second. This is ten times faster than the sync speed that PhaseOne brags about with their leaf shutter lenses (that being 1/1600th sec).
The shutters on these cameras aren't anything special. In order to get higher shutter speeds, the shutter opens and stays open while the computer samples from the sensor for the duration of the selected "shutter speed." Therefore the exposure is controlled by the sampling interval and not the physical shutter blades, so even at very high shutter speeds, there is no risk that the shutter curtains will block the sensor for part of the shot. Thus all the low power problems that you have with HSS, and the exposure gradations you get with hyper-sync and such technologies aren't a problem with an electronic shutter because you are using the flash full out and not sweeping the shutter curtains across the sensor while the flash is firing.
At 1/16000th sec, I had to use four flashes - the SB-26, an SB-16, and a pair of SB-800s. At this shutter speed, the light from the flashes was acting as a constant light source, and the sampling interval was so short that one flash didn't give enough light to correctly expose the shot.
Note that portrait and sports pros that want to light subjects outdoors often use HSS and Hyper-sync/Hi-sync technology to freeze action and to allow them to control the DOF or the background intensity, or both. Dylan Patrick uses this to allow him to shoot portraits at f/2.8 outdoors on a sunny day and thereby blur the background; Peter Hurley uses it to control the exposure of the background when lighting a subject outdoors.
This 15-year-old technology removes the disadvantages of HSS and Hyper-Sync and allows us to do high shutter speed flash with any regular studio lights or flashes. Why Nikon discontinued this technology is a complete mystery to me, and I seriously doubt we will see it return unless we start haranguing the camera manufacturers about it. Note to Sony, Pentax and Olympus - want to get a leg up on the big two in the portraiture and sports arenas? Develop this technology while Nikon and Canon sit on their hands.
Want to know more about this? See this link.
The results are in order at 1/2000th, 1/4000th, 1/8000th, and 1/16000th second.
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Edited by justshootit, 18 December 2016 - 09:35 AM.