>>3138733>the sensor is so small, and so little light is diverted to it.On the other hand the pixels are huge and have incredible dynamic range.
Using an image sensor, with its limited dynamic range, for exposure measurements is also just a compromise.
>But I guess if you're fine with that. More power to you.It's just to check if some areas of the picture are over/under exposed.
Why would you need to see millions of areas?
You wouldn't even be able to see the zebras on areas that small.