Sly

Hi Bob123, I am not a detector technolog, but I use and characterise detector for science application. So my comments are just reflection and gesses, not coming from a global shutter cmos expert. 1/ Apparently the technologie is there already https://news.panasonic.com/global/press/data/2018/02/en180214-2/en180214-2.html . However the fact it is still not in current mirrorless camera means that the technology is not completely ready. When ? I have no idea. But it is getting more and more concrete. 2/ My guess is that it will depend on how good will work the global shutter. If it is working good enough so there is no light leek in any photographic condition, mechanical shutter should disappear. It is only a guess. 3/ The idea of using flash is that, the flash light is making the exposure on the subject, not the shutter speed. With mechanical shutter you have to flash after the shutter is fully open and before the shutter start to close otherwise you will see the shutter shadow on your image. The more you shorten your exposure, the more significant become the shutter time (the shutter-time/exposure-tim ratio increase). The global shutter promise that this electronic shutter time is near zero so no more lag, but still your burst of light has to be synchronise to the exposure and as to be shorter or same time than the exposure if you want the photo subject to be expose by your flash only (and not shutter speed). It will still be a limiting factor. How fast they synchronise ? I have no idea :) 4/ c.f. limiting factor expose in 3/. I doubt they can synchronise flash and exposure at 1/8000th of a second (even with global shutter), so still HSS will be necessary in these cases. In HSS the photo subject exposure will be set by the flash burst and the exposure time (and not flash burst only). I reached the limit of my knowledge to add concrete numbers to it. Sly