Choderboy wrote in post #19100030
There is no need to do anything. I have never seen an analysis of what Sony A9 does.
EVF refresh rate can be anywhere from 50 fps to 120 fps depending on user choice.
Shoot 20 fps and I don't think 50, 60, 100 or 120 EVF fps is maintained.
Nothing needs to be inserted. It just slows down.
That's more of a semantic difference than a practical, visual one. If you're being fed fresh, relevant information every 1/120s, and then suddenly, when a new, unique frame should be there, you see the same one that you just saw previously, then it doesn't matter if the same pixel values were sustained, or if they were "replaced" by exactly the same values. The effect is the same. Changing those values to a blank or solid screen, as soon as no new information is available, prevents the presentation of irrelevant information that can only confuse.
User just points at a flying bird, takes 40 shots in 2 seconds, notices nothing regarding EVF issues until checking results and sees 35 or more well focused shots, then complains about how annoying it is to have chose which of the 35 shots to keep.
Another person is tracking a more erratic subject, and loses track of it more often, because of confusing and inconsistent timing information.
"Blackout" has become the devil that lots of people are looking for, but the real devil is the lost information, not the choice of blackout, vs lying about time and location. It is bad enough that the EVF lags reality a tad, but that lag can be consistent, with blackout instead of sustain or repetition. Once you start sustaining or repeating frames, the lag becomes irregular, and longer, until you see the least-delayed live view again for a short while, and re synchronize.