Pi said:jrista said:Full well capacity is really more a function of pixel area than pixel Q.E. Area is the defining factor when it comes to how much charge a pixel can hold. Increasing Q.E. might improve sensitivity, which is the rate at which photons convert to charge, but it doesn't do anything to increase the maximum charge (FWC) a pixel can contain. That is why cameras with larger sensors generally perform better than smaller sensors...they have historically had larger pixels.
No, larger sensors perform better (for a given exposure) because they are, well, larger. Pixel size is a secondary, mostly irrelevant factor.
Correct. I did read, and still remember, the article on equivalence. So, correct, assuming you are always using the full sensor area. There are situations where you don't, say cropping for detail. In which case, the part of my answer you did not quote applies...it's a tradeoff. I am not about to say pixel size is the most important factor, however I would say it is far from a "mostly irrelevant factor." It all just depends, and you make the various tradeoffs you have to in order to get what you need so service your own personal photography best.
In the end, one could often make the argument that neither pixel size nor sensor size really matters in the end anyway, as a more significant factor in final image quality is how you process, so long as the image output size is smaller than the input size (which is by and large the most common case these days with publishing occurring on the internet far more than it occurs in print in any form).
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