Last August, I wrote about picture quality finally winning against macho marketing. In other words, it seemed Canon, Nikon and Sony were giving up the simplistic escalation: my camera has more pixels than yours, therefore it is better. In the P&S (Point & Shoot) category especially, the facts were that more pixels ended up producing mediocre pictures.
P&S cameras are the smaller (not necessarily simpler…) models you carry in your pocket and purse, as opposed to “superzooms”, bigger lenses with a wider range of focal length, or DSLR, bigger, heavier but also better, more flexible.
As discussed earlier, a look at DP Review’s excellent camera database will make the problem clearer: pixel density per cm² varies from 1.4 million, for high-end DSLRs, to 43 million for some P&S models. The smaller the pixel, the less photons received. The less photons per pixel, the less electrons they convert to in the sensor. This makes it harder to separate the “good” (picture) electrons from the “bad” (circuitry noise) ones. Everything else being equal, the result is higher pixel density means higher picture noise, that is worse picture quality, especially in low light when fewer photons fall on each sensor pixel.
(DP Review, arguably one of the 3 to 5 best photo sites on the Net, is now owned by Amazon. IMHO a smart move considering Amazon’s general reliance on user reviews to help its customers make good choices and, as a result, come back, and come back…) More