EXCERPT page containing first few paragraphs. 2019-09-17 00:21:54
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A misleading characterization of noise is that higher-resolution cameras have more noise. Consider that the same size sensor has by definition the same area, and thus exactly the same light falls upon it (albeit dividing it into smaller buckets aka photosites). And there are certain signal/noise issues that can arise as ISO becomes extreme, some of which depend on electronics (not just the sensor). But in the main, noise is very similar given equivalent sensor designs of the same area since the same number of photons are available for capture ( there can be losses due to internal sensor wiring and this is one factor for higher-resolution sensors).
The practical consideration for noise is thus how images are viewed: prints and/or computer viewing both are done at some enlargement factor. A viewer examines the image at that enlargement size, not 12MP of a 12MP image vs 12MP of a 42MP image yet the latter is all too often how noise is assessed.
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
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