Busy busy busy today, traveling, conferences etc, etc…. ergo…. a Cat 4 / emergency blip ;-)
At first I wanted to let everyone guess what this could be, but realized I won't even have the time to answer everyone.
So, already wrote the answer of this macro close up in the title.
Strange that it's really blinding to look into with the plain eye, but the camera 'sees' something completely different.
Have a nice weekend, I'll be catching up sleep most of it ;-))