Pixel density - can the playing field be leveled???

Started Jun 6, 2009 | Discussions thread
John Sheehy Forum Pro • Posts: 21,623
Re: Per area read noise?

Steen Bay wrote:

Is it correct that a hypothetical 20mp G11 would have 1 stop higher per pixel (and 'image level') noise and 1 stop less DR than a 10mp G11, assuming a 'perfect scaling' of the read noise? And if the read noise isn't scaled, if the 20mp camera has the same per pixel read noise as the 10mp camera, won't the difference in DR and in the shadow/high-ISO noise then be larger than 1 stop?

Define "read noise"; IOW, what are the units?

If read noise is a value relative to saturation or metered gray, in ADUs, then "the same" pixel level read noise will decrease image read noise to 71%. If we are measuring in electrons, then maintaining read noise at the pixel level will increase read noise by 41%.

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