more pixels are better!

Started Dec 14, 2008 | Discussions thread
OP Iforgetwhat8was4 Contributing Member • Posts: 795
Re: more pixels are better!

Thanks all, for your input.

Let me take another shot at understanding...

For a given sensor size and given chunk of light (more or less base ISO), the camera can fill its pixels with enough photons that it can statistically supress noise. This allows a 12mp compact, in good light, to produce a file that can be enlarged beyond a 6mp DSLR without showing pixelization. (Other limitations of the small format might separate the image quality, however.) This is the easiest way for a compact to rival some of a DSLR's capacities, so the designers are motivated to do so.

Now, if you add more pixels, you cannot capture more information. The noise increases with the number of pixels, and you end up dividing up noise and signal without increasing the latter. The same thing happens when you increase ISO (reduce the chunk of light - the signal). So at higher ISO, the sensor is not optimized to that level of light and binning isn't perfect, so you lose more than you would with fewer Mp to begin with. (???)

There should be a physical and practical limit to the number of useful pixels for a given sensor size and EV, correct?

Am I warm?-)

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