Shadowblade wrote in post #17397399
For these applications, EVFs and their processors currently used in mirrorless stills cameras
are not sufficient. EVFs capable of handling fast action exist, and have been used for a while in video cameras for shooting sports.
gjl711 wrote in post #17397584
This has to be an implementation issue, not a technical one. Even my cell phone can track objects when in video mode with no noticeable lag on the lcd what so ever. Every consumer video camera does the same so clearly reading the sensor data and translating that into a picture without lag is possible today. Why there is lag in a mirrorless is puzzling.
I don't think that you can use video as an argument against the lag problem when shooting stills. They are totally different scenarios and the lag is still there with video, it just doesn't matter.
The issue with EVF lag in still shooting is that you are taking a single shot, where you want to capture the perfect moment such as the baseball bat hitting the ball, or the soccer tackle just as the foot hits the opponents ankle. With shots like these you need to be able to trip the shutter at precisely the right moment, and you can't do that properly when what you are seeing is delayed by even a very small amount. Lag is an issue when trying to capture a precise moment. With video, there is no attempt to catch a precise moment, you shoot the pitch, the swing, the hit and the balls flight to the catcher all as a sequence. There may be no frame where the ball is actually contacting the bat, it doesn't matter because our brains fill in the gaps when watching a sequence of still frames presented as a movie, that is why we see "normal motion" during playback. Hang one single frame on the wall though and it needs to be precise.
Of course you don't see the lag in a video shot, you would only see it at the start of the scene being filmed, and nobody tries to start shooting a video of something happening by catching the point of peak action when they first press the shutter button, they want to capture the whole action so start shooting as it is about to start.
I have no intention of replacing my DSLRs for action work, I might by an A7r for landscape and architectural work, they don't tend to move too fast, but I have not seen any sign that EVF technology can handle the action work for STILL photography. If the day comes when a mirrorless can match the performance of a DSLR, then I wouldn't have an issue buying one, but it would have to be AS GOOD AS in every department, being close just doesn't cut it. I want to,be able to look through the viewfinder and see a view that is as clear as an optical VF and know that what I am looking at is what is happening this instant, not a fraction of a second earlier and things have moved on in the real world. I tried photographing drag racing with an EVF and it was an exercise in futility, the cars were well ahead of where I was seeing them, I had to adopt the shooting technique of duck hunters and fire ahead of the the subject as I saw it, so that it would be in the right place as I took the shot. I got really fed up with pics of the back end of race cars disappearing out of frame. To be fair, that was some time ago and I am sure they have improved since, but whilst less lag is good I don't want ANY lag.