Sebastian Krzyszkowiak  

That's how straight lines look like through your phone's camera lens. Such distortion needs to be corrected in software.

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Mobian  

@dos is the distortion lens-specific, ie the same in each device? Or are there big individual device differences?

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Sebastian Krzyszkowiak
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@mobian It is lens-specific and there is a database commonly used by image processing applications to apply such corrections (lensfun). This photo isn't a very great specimen for calibration, but it should be enough to let me learn how to do it 😜

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