Re: A7rV for BIF? More recent af vs stacked sensors
tschopp wrote:
For BIF or other fast action, I would expect the A1 focus to be better due to the speed of the sensor. The A1 does 120 focus calculations and lens updates / second (4 / shot @ 30 FPS). The a9's do 60 focus / second or (3/shot @ 20 FPS). I haven't been able to find focus speed info for the r4 or r5, but I would guess it's in the 20-30 focus / sec (2-3 / shot @ 10 FPS). So the A1 is doing 4-6x more focus measurements, I don't see how the fancy AI chip can compensate for that.
I have never believed that the metric of how many focus measurements per frame is particularly relevant. We can make the A7RV ratio beat the A1 on that metric just by choosing a slower frame rate. Do the math.
The benefits of the faster focus rate is relevant to the speed of the subject, not the frame rate ratio. In that sense faster is better.
The new AI focusing processor can compensate for slower focus calculation speeds by being more accurate due to the predictive nature of the AI. You can see this happening in the viewfinder.
To me the big difference in the tw approaches is the real time tracking and refresh rate of the EVF. It makes it much easier and a better experience with the A1.
Jan 22, 2023 at 10:53 AM
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