This article should be read by everybody

Started Dec 12, 2013 | Discussions thread
tbcass
OP tbcass Forum Pro • Posts: 38,239
Re: Sony a57 vs A77 Proof that Pixel Count Affects Noise

lhkjacky wrote:

The reason is also written in the article .

At some point, pixels become so small that the assumed idealized scaling (with an assumed constant fill factor and constant “quantum” efficiency) will no longer apply: four 2.5×2.5 µm pixels together would capture less light than one 5×5 µm pixel (because of wiring that gets in the way, mechanical overlay tolerances on filters, “fill factor”, etc). The resulting decrease in signal-to-noise ratio would negatively impact the DxOMark Camera Sensor score.

That only implies that there is a threshold where pixel density becomes so great that the light gathering efficiency becomes less and S/N ratio becomes less. The rest of the article shows that at 24mp on APS-C that point has not been reached or exceeded. I suspect though that 24mp may be close to the limit with existing technology so greater resolution requires larger sensors. That may change in the future.

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Tom
Look at the picture, not the pixels
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Miss use of the ability to do 100% pixel peeping is the bane of digital photography because it causes people to fret over inconsequential issues.
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