So this was taken through a normal camera lense? I would question whether a lense has the full mulitcoating regime that is used in telescope optics but I could be wrong. Be aware that the stock sensor cover glass is also highly reflective as shown below.
Watch this utube video of a comparison of the stock cover glass reflectivity with an Astonomik MC Clear cover glass.
https://www.youtube.com/watch?v=pwYmmNtGTqg
You maybe getting light bounce off the coverglass that is being reflected back and scattered by the rear of the lense elements.