The best compromise for a compact camera is a sensor with 6 million pixels 

or better a sensor with a pixel size of >3μm.

對(duì)于便攜式照相機(jī)而言，最好的折中是有600萬(wàn)像素的光感器或者單個(gè)像素的大小大于3微米。

The result is a decrease in sensitivity of the camera and an increase in noise because the 

amount of light collected by a single pixel is smaller. At the same time, increasing the number 

of pixels is supposed to lead to more details (resolution), but in order to achieve that better 

lenses with high resolution and a lower lateral chromatic abberation are needed. However 

better lenses are bigger and don’t fulfill the requirements for ‘small’ cameras any more.

由于單個(gè)像素點(diǎn)收集到的光變少量，相機(jī)的靈敏度變低，畫(huà)面“噪音”增加。同時(shí)，增加像素個(gè)數(shù)將導(dǎo)致更大的分辨率，但

為了得到更大的分辨率，就需要高清的更好鏡頭和更低的橫向色差。但更好的鏡頭尺寸更大，不能滿(mǎn)足小型攝像機(jī)的需求。

Digital SLRs with many pixels are okay.

Digital single lens reflection cameras (SLRs) basically show the same behaviour but the sensor 

of those cameras and the single pixel is much bigger. Therefore, the cameras have higher

 sensitivities and show less noise. The high quality lenses provide the necessary resolution 

and the cameras are designed for high pixel counts

數(shù)字單反攝像機(jī)的鏡頭是更大的，所以當(dāng)像素更高時(shí)，它能提供更清晰的圖像（具體我就不翻譯了。。）

具體請(qǐng)參考：http:///en/