theSuede wrote:
The Y scale is in Ev, or \"stops\". And the metrics are, from top to bottom:
Dynamic range at Base ISO (FWC compared to read-noise)
Dynamic range at true ISO800, not the \"ISO800\" that the camera states
Base ISO signal to noise ratio at 18% of FWC true ISO200 - not camera \"ISO200\" - signal to noise ratio at 18% of FWC true ISO800 - not camera \"ISO800\" - signal to noise ratio at 18% of FWC
And lastly, signal to noise ratio at 1% of FWC, at base ISO. This is deep shadow noise at base ISO-
I see that I clipped the \"%\" sign in some of the legends in my diagram when copying/pasting... Sorry. 7D to be added soon, but I\'m waiting for DxO to verify my \"true\" ISO-sensitivity measurements.
Although I don\'t quite understand all of it, this is very interesting information. Thanks for sharing.
What about ISO measurements greater than 800? That is a shooting range which many have expressed high interest in.
So, broad-brush speaking, as long as we don\'t see \"per pixel\" performance decline, the overall IQ of a given sensor form-factor (e.g. crop sensor) will continue to climb as pixel densities continue to go up?
What about the size of the individual pixels? I thought I had mostly read that larger pixels achieve a better SNR than smaller ones? This could explain why FF sensor form-factors achieve higher IQ than crop sensors?
Your chart tends to confirm why I\'ve liked my 20D and have held on to it for so long. Somewhat sadly, it will be sold on Sunday.
theSuede wrote:
The Y scale is in Ev, or \"stops\". And the metrics are, from top to bottom:
Dynamic range at Base ISO (FWC compared to read-noise)
Dynamic range at true ISO800, not the \"ISO800\" that the camera states
Base ISO signal to noise ratio at 18% of FWC true ISO200 - not camera \"ISO200\" - signal to noise ratio at 18% of FWC true ISO800 - not camera \"ISO800\" - signal to noise ratio at 18% of FWC
And lastly, signal to noise ratio at 1% of FWC, at base ISO. This is deep shadow noise at base ISO-
I see that I clipped the \"%\" sign in some of the legends in my diagram when copying/pasting... Sorry. 7D to be added soon, but I\'m waiting for DxO to verify my \"true\" ISO-sensitivity measurements.
Although I don\'t quite understand all of it, this is very interesting information. Thanks for sharing.
What about ISO measurements greater than 800? That is a shooting range which many have expressed high interest in.
So, broad-brush speaking, as long as we don\'t see \"per pixel\" performance decline, the overall IQ of a given sensor form-factor (e.g. crop sensor) will continue to climb as pixel densities continue to go up?
What about the size of the individual pixels? I thought I had mostly read that larger pixels achieve a better SNR than smaller ones? This would explain why FF sensor form-factors achieve higher IQ than crop sensors?
Your chart tends to confirm why I\'ve liked my 20D and have held on to it for so long. Somewhat sadly, it will be sold on Sunday.
Oct 02, 2009 at 02:57 PM
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