After reviewing 4-5 photos from that morning at the beach taking pictures of my girlfriend with the mountains behind here I noticed somthing in one of my photos. I have included the two closet photos.I have 2-3 others about 1 minute later of me...with nothnig there for miles.I am fairly certain my lens was not dirty between these exposures but I could be wrong. Need some opinions.At first I thought it was a parasail but there are no boats and I don't recall seeing any...plus the fact its not in any other photo shoule take out that theory.