Sensibility versus definition

Started Jan 7, 2015 | Questions thread
OP PeterBM New Member • Posts: 4
Re: Sensibility versus definition

Thanks to try to explain.

You are right: resolution is the good word, not definition.

My question. With a given camera, say with a 4000x 3000 sensor resolution i can choose (most cameras have this kind of choice in their menu) to get a photo with a 4000x3000 photo resolution or a 2000x1500 photo resolution (same ratio, notice).

In first case a sensor pixel provides data for one photo pixel. In the second case, there are ( is it true ?) 4 sensor pixels for one photo pixels, so I could expect four times less amount of light going through the lens for the same scene. Why is it false ?

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