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Maybe there was some instability of the tripod initially that seems like a logical explanation and reminded me of an issue I came across on my NZ trip see attached its a lot less pronounced in the more recent shot so I didnt put 2 and 2 together. The attached was with the 24mm lens so less distortion on the corner shots but my tripod head ball joint has come loose.
What your saying Ed makes sense it most likely occurred early in the exposure meaning only the brightest parts where effected.
Thanks for the thoughts/suggestions everyone, off to ensure the ball joint is nice and tight again.
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