Toralf Lund wrote: > Derby Chang wrote: > >> Toralf Lund wrote: >> >> >>> [ ... ] >>> Indeed. But one of the questions I was asking was really, is the output >>> on the poorer performers just a result of bad processing choices that >>> might be fixed on the outside? >>> >>> - Toralf >>> >>> >>> >>> >>> >> Not quite. The voltages coming out of the CCD/CMOS cells are miniscule. >> Improvements have been made by moving various amp circuits onto the >> photosites, rather than circuitry sitting on the periphery of the >> sensor. >> > Yes. I can understand that. But what I'm trying to say is that I'm not > sure I quite see how this affects only high ISO values (which everyone > seems to be talking about.) Shouldn't these improvements mean there is > less noise across the entire range - since the signal always has to > travel though these circuits? (Or doesn't it?) > > > - T > > > There is less noise across the entire ISO range. But when you don't have to amplify the signal (i.e. when you are in low ISO), the noise is less apparent to begin with. Only when you boost the amplification do you see the improvements in noise reduction.
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