A group I’m in on fb had a post that seemed interesting..

“Taken this summer. Did not spot anything abnormal when I took the first pic. I then spotted what I thought was a bird until I zoomed in and this is what I caught. No idea what it is. Any thoughts?”

When it was suggested that it could be time to get a new lens, the OP replied – “ new and if a blemish it’s the only one. Took about 15 pics with same camera and lens the same day.”