In the previous post I had already told you how low megapixels are better than high megapixels. But if you are interested to know deeply why this happens then you can read further about it here. We saw that a smaller sensor allows less light to enter an image vs a larger sensor allows more light to enter an image. When a sensor has large pixels per inch (ppi) then they have a larger capacity to store light. And this is possible for a lower megapixel camera.
On the other hand, when a sensor has smaller pixels per inch then they have a comparatively smaller capacity to store light in each pixel. This is possible for a higher megapixel camera. However, higher megapixels are least noisy vs lower megapixels but you get a brighter and a well-exposed image in lower megapixel camera than a higher megapixel camera.
Detailed research on pixels and the amount of light entering them has brought out something interesting and an easier way to understand why this happens. The pixels and light entering have given specific analogy and the explanation is now way easier to understand.
‘Bucket’ as the analogy of a pixel and rain falling in it as the analogy of photons (light) entering in it. Imagining a larger bucket we can store much of the rain falling vs in a smaller bucket. Remember, the difference in their sizes is signified by the difference in their widths.
Here lower megapixels work on this analogy of a bucket and rain falling. They have larger pixels which can therefore capture more light hence a brighter image. Higher megapixels have many pixels but tiny is sizes.
Sensors of DSLRs are generally larger than that of a smartphone camera. You get nearly the same number of pixels in a 12 MP DSLR and an 8 MP Smartphone camera. But the pixels of DSLRs are much larger than those of the smartphone camera.
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