Samsung did not mention the exact camera sensor that it was using in the Galaxy S6 and the Galaxy S6 edge, but various tests revealed that it was IMX240 from Sony, which was also used in the Galaxy Note 4.
Now, we've learnt that some Galaxy S6 and S6 edge units are being shipped with Samsung's own ISOCELL camera sensor instead of the Sony one.
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As you can see in the screenshot below, our own Galaxy S6 edge has a Samsung camera sensor with model number S5K2P2. Details about this new camera sensor aren't out yet, but we guess that it should be similar to the IMX240 from Sony.
Users from all over the world are reporting either Sony or Samsung camera sensor strings in the XDA thread below, and there doesn't seem to be any production period, model or carrier pattern determining which sensor goes into what handset.
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It's not clear why Samsung is using two sensors and if it is region specific. As we have observed that Samsung S6 and S6 Edge has brilliant photography capabilitires and can be considered as one of the best in the market.