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That's basically it but the amount of light reaching that sensor is improved by a somewhat larger lens than you usually get on a smartphone.

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Sure. The more glass you have the more photons you can gather. I have a f1.2 50mm lense and the amount of photons it can pull in is amazing. There is no way any phone is going to be able to replicate this.

For a given exposure duration.

Unfortunately, things move.

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