Three strikes, and you are out !!
Yep, my third rookie mistake.
Not cleaning the sensor.
First picture taken for maximum sharpness, the second to get some prop blur.
Didn't I see the flock of dustbunnies before ?
To be honest, no.
I mostly shoot soccer, see above, where the dustbunnies are hidden in the trees and thus invisible.
I did notice the tiny 'hair' in the center but a little touching up fixed that in the cases it was really obvious.
(the learning curve is slowly flattening)