When shooting directly into the sun you can get an unwanted reflection off the lens elements within the lens. This is known as lens flare. Sometimes you can’t see these in the viewfinder and when shooting sunsets it is best to frequently slightly change your angle to assure you capture an image without flares. (https://imageryphoto.net/2014/01/29/pirate-sunset/)
I could have tried for days to create this flare without success. It almost looks as if a spotlight is on this couple watching the sunset.
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