70D Dynamic Range is actually great, despite what DXOMark says

Started Jan 21, 2014 | Discussions thread
rwbaron Forum Pro • Posts: 14,218
Re: 70D Dynamic Range is actually great, despite what DXOMark says

Just another Canon shooter wrote:

rwbaron wrote:

Just another Canon shooter wrote:

This is a really weird view of the data. You think that you can separate the read noise of the sensor from the read noise of the circuit, whatever those two mean? You are just saying that at high ISO, the two sensors look similar but we knew that.

In any case, at base ISO, the read noise is much worse.

David is absolutely correct. This has been discussed ad nauseam on the Canon forums by some very knowledgeable people. Canon's sensors are actually excellent and may be the best in the industry currently. It's their ADC being off chip that leaves the signal in analog state too long that's the problem.

How does this contradict what I said and what difference does it make? Most of the read noise comes from that circuity anyway, we know that. Amplifier noise is a major part of the "read noise" - Wikipedia. See, it is called read noise, not sensor noise. Unless we have a way to replace the ADC, we take it as a whole, and the results are known.

Sony's Exmor column parallel on chip ADC coverts the signal to digital immediately on chip.  Canon's ADC is off chip so the signal stays analog for a much longer path and time subjecting it to noise.  Others can certainly explain it better than I can.

Bob

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