Thanks useful information: 
hey guys, going over some photos i took the other week and i zoomed in to 100% then 400% (see screenie) and there is a purple haze bordering the subject. this was taken @ 4pm with the sun slightly infront of me with no lens hood if that helps? what is it and how can i avoid it in the future, i realised alot of that set of photos had the same issue.
thank you
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