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A smaller well will improve high-ISO performance, and also tone resolution at high ISO since the error margins are lower for small amounts of light in a small well than for small amounts of light in a large well.
Thanks ... this helps.
If I understand correctly:
High ISO = small well strategy
Low ISO = large well strategy
High DR Scene = small well strategy
Low DR Scene = large well strategy
Right now, all my cameras use approximately the same pixel size, targeted toward large well, low ISO approach. Up till now, I've been of the perspective that I do not need anything with high ISO performance, since I'll just use a tripod instead for low illumination levels. But, it sounds like the strategy of design for high ISO shares benefit for increased DR range.
If I've understood correctly, then a small pixel sensor could be an augmentation to my current bodies, realizing that high ISO usage may not be the only application beneficial for its use ... i.e. high DR range also.
That being said, it would seem that the more pixels debate is about more than just increased resolution, depending upon which application(s) you are shooting, i.e. high DR, low DR, shadows, highlights, @ high vs. low ISO, etc.
Please continue to correct as warranted.