DPI (dots per inch) is an output parameter and is completely irrelevant to the camera.
Imagine taking a picture that's 2000 pixels by 3000 pixels. When you make a 4x6 print, you're printing at 500 dpi. If you make a 8x12 print, you're printing at 250 dpi. Either way, it's exactly the same picture as taken by the camera. The camera doesn't know what size print you're going to make, so it just puts in a default value. The dpi is set when you print the picture, not when you take it.
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