If you too can't grasp the principle that photons are converted to electrons
proportionate to the intensity of light, then what can I say?
That's true, but as I understand it, the analog to digital conversion is not achieved by counting electrons or photons and that's the crux of our disagreement. If it we did simply count electrons or photons, then there'd be no need for an a/d convertor. This would simply be a purely digital device and we'd be capturing numbers at the sensor. I don't profess to be an expert in the intricacies of sensor workings but its my understanding that we are measuring an analogue signal produced by the sensors response to light. The more electrons produced, the stronger the signal, but we aren't literally counting electrons. I'd be happy to be shown otherwise. I'm curious about how this stuff works and its why I participate in threads like this. I assume the strength of current produced by a given cell changes based on the amount of light hitting it. In the a/d conversion the highest number available it assigned to the maximum signal. Bit depth determines how big that number is and thus how many potential definable steps there are between the lowest and highest measurable signal. As someone else suggested its just the sampling rate. It doesn't change the endpoints of the analog signal only the precision with which it's sampled.
Bob Smith
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