Sony RX10M2/RX100M4 sensor readout speed

Started Jul 28, 2015 | Discussions
Horshack Veteran Member • Posts: 8,732
Sony RX10M2/RX100M4 sensor readout speed

Sony claimed a 5x improvement in readout speeds for the stacked sensor in the RX10M2/RX100M4 vs the previous generation RX10/RX100M3. Not sure what the precise readout speed was on the RX10/RX100M3 but I presume it to be 1/30 to match to its non-binned 1080 30fps video. The RX10M2 is the first camera I've seen that supports flash operation with its electronic shutter (other models force you to switch to the mechanical shutter when using flash). The max flash sync rate with the electronic shutter is 1/100, so I presume that is what the sensor readout rate is.

Here's what the electronic shutter exposures look like for faster sync speeds, made possible by using an external non-Sony flash on the hotshoe:

1/100

1/125

1/160

1/200

1/250

1/320

1/400

1/500

1/640

1/800

1/1000

1/1250

Sony Cyber-shot DSC-RX10
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DSPographer Senior Member • Posts: 2,483
Re: Sony RX10M2/RX100M4 sensor readout speed

The maximum video frame rate implies a line scan capability of 384 lines X 1000 frames/sec.

This rate yields a 1/105 second full frame scan, or a 1/125 second 16x9 scan.

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Olfdee Regular Member • Posts: 135
Re: Sony RX10M2/RX100M4 sensor readout speed

Horshack wrote:

The RX10M2 is the first camera I've seen that supports flash operation with its electronic shutter (other models force you to switch to the mechanical shutter when using flash). The max flash sync rate with the electronic shutter is 1/100, so I presume that is what the sensor readout rate is.

Nikon 1's Aptina sensors from the very beginning offered (like in J1) flash with e-shutter, it was capped at 1/60s. That is just for the record.

I've got my doubts about precise meaning of the 'sensor readout speed': they might have increased read rate from the sensels (although some tests suggest that only moderately), but it feels like sticking DRAM and adding extra circuitry rather increased data trasfer rate from the chip to the downstream electronics (hence 16fps burst rate and 1000fps slow-mo video). Both processes fit the term 'readout speed', but affect different areas.

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Svetlov Misha Forum Member • Posts: 79
Re: Sony RX10M2/RX100M4 sensor readout speed

DSPographer wrote:

The maximum video frame rate implies a line scan capability of 384 lines X 1000 frames/sec.

This rate yields a 1/105 second full frame scan, or a 1/125 second 16x9 scan.

384 is a triple smaller scan speed needed as 1080 lines do also there are 16bit or 14bit or 12bit for photo mode against 8bit or even less movie mode

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