jayphotoworks said:neuroanatomist said:jayphotoworks said:...the AF is exceptionally fast and like the reviews say, it is reactive because it doesn't have to be predictive with absolutely no blackout. You can't fully grasp that...
So you're saying the a9 has absolutely no shutter lag? Even though Imaging Resource measured it at over 200 ms? Or are you saying that moving subjects don't move over the course of 2/10 of a second? You're right, I can't fully grasp that.
I wasn't talking about the shutter lag, I was talking about the viewfinder blackout. There is none on the A9. On any OVF DSLR, there is the constant movement of the mirror. 60ms on the 1DX series and 125ms on the 5D series.
Remember though, that number is the aggregate time for the mirror to both open and close.... and the pattern is not symmetrical as it takes the mirror less time to flip out of the way than it does to return. This would make the delay caused by the mirror to be 30ms (or less) on the 1DX.
So you push the shutter, the camera does AF and metering (non-deterministic amount of delay), then the shutter starts moving and 30ms (or slightly less) later the exposure starts. At the end of the exposure, the mirror starts to return and it takes 30ms (or slightly more) for the mirror to return. However, the camera is not sitting there waiting and doing nothing while the mirror returns, it is reading the sensor, processing the image, and storing it to memory and then transferring the image to card(s)..... which probably consumes most (or more) of that 30ms mirror return time.
And the A9? It still takes time to read the sensor, and it also takes time to process the images afterwards... Mirrorless may not offer as much speed advantage as one first thinks....
That said, I have a mirrorless P/S camera that will crank out 100FPS, but at a very reduced resolution. I think that it is safe to say that a sensor can be read in 10ms or under, but the real bottleneck seems to be processing data and storing it....
Things are never simple in a complex system.
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