Can anyone explain the stepped diagonals?

Started 1 month ago | Questions thread
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1HappySnapper Regular Member • Posts: 184
Can anyone explain the stepped diagonals?

Someone I know is dissatisfied with his drone photography because of the poor photo quality. The lens distortion is a known issue, but what is the cause of the stepped diagonals. NB, the picture is not so low res that it is pixelated, the obvious reason for steps. So what is it?

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