iphone 8 plus

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    How to fix this image taken with my Iphone 8 + ?

    Hi all, I shot this image of a vintage amplifier with my Iphone 8 +. I positioned the lens of the iphone right at the middle of the amplifier, but you can see the problem... the knobs are distorted. How can I fix this? I can buy an external lens but which? thank you so much! Jorge