patotts wrote:
OK, instead of guessing, I asked Google AI Pro/Gemini 2.5
How is the data read?
The sensor reads all 24.6 MPs simultaneously and instantaneously, not row-by-row. There is no scan time. This simultaneous, instantaneous readout is incredibly efficient. It eliminates the sequential data bottleneck and frees up the processing pipeline. The camera has massive bandwidth available because it's not waiting for a sequential readout process to finish.
Why Resolution Doesn't Drop?
Because the bottleneck is gone, the camera can easily maintain full EVF resolution while still performing 120 AE/AF calculations per second and shooting at up to 120 fps . The data for the high-quality EVF feed is always available instantly, allowing the camera to dedicate enough power to the EVF without having to sacrifice its fidelity.
The AI is missing the point I think.
I have written code to grab data from cameras. If you did this you will find that some sensors / cameras are able to output multiple data streams simultaneously.
Nikon actually markets this as "dual-stream technology", but its not really that novel. Even some security cameras can do it these days.
The A9iii sensor is capable of the following simultaneously
1. 120fps 24MP 14 bit raw image stream
2. 120hz High Resolution EVF image Stream
The A1ii sensor is capable of the following simultaneously
1. 30fps 50MP 12 bit raw image stream
2. 120hz (i think) Standard Resolution EVF image Stream
The A1ii sensor can output this independently
1. 60hz High Resolution EVF image Stream
If you think about it, it makes sense that the A1 II disables the 60 Hz High-Resolution EVF stream while shooting. How could the camera perform 120 fps autofocus calculations if the input image stream were only 60 Hz? From an engineering standpoint, it wouldn’t make sense to process both a 120 Hz data stream for AF and a separate 60 Hz high-resolution EVF stream simultaneously.
patotts wrote:
OK, instead of guessing, I asked Google AI Pro/Gemini 2.5
How is the data read?
The sensor reads all 24.6 MPs simultaneously and instantaneously, not row-by-row. There is no scan time. This simultaneous, instantaneous readout is incredibly efficient. It eliminates the sequential data bottleneck and frees up the processing pipeline. The camera has massive bandwidth available because it's not waiting for a sequential readout process to finish.
Why Resolution Doesn't Drop?
Because the bottleneck is gone, the camera can easily maintain full EVF resolution while still performing 120 AE/AF calculations per second and shooting at up to 120 fps . The data for the high-quality EVF feed is always available instantly, allowing the camera to dedicate enough power to the EVF without having to sacrifice its fidelity.
The AI is missing the point I think.
I have written code to grab data from cameras. If you did this you will find that some sensors / cameras are able to output multiple data streams simultaneously.
Nikon actually markets this as "dual-stream technology", but its not really that novel. Even some security cameras can do it these days.
The A9iii sensor is capable of the following simultaneously
1. 120fps 24MP 14 bit raw image stream
2. 120hz High Resolution EVF image Stream
The A1ii sensor is capable of the following simultaneously
1. 30fps 50MP 12 bit raw image stream
2. 120hz (i think) Standard Resolution EVF image Stream
The A1ii sensor can output this independently
1. 60hz High Resolution EVF image Stream
If you think about it, this makes sense. The A1ii has to pull a 120hz stream for its 120 af calculations per second. I think the camera is running these AF calculations on the EVF stream. It makes less engineering sense to pull a third data stream from the sensor.
Oct 20, 2025 at 08:14 AM
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